Sparkler sat to Rainbow Dash's left, both perched on the dresser in reduced-age forms, watching what was going on on the bed: Thunderlane had been equalized with Rumble in age, and they stood reared up, hugging, hanging breathlessly on each others shoulders - for Fluttershy and Derpy stood on each side, alternating giving each of the brothers blowjobs. Sparkler looked to Rainbow. "Is that… actually fun to do? They seem… concentrated."

"Making somepony squirm and groan? Yeah, it's great." Rainbow, as bad at subterfuge as ever, was entirely unable to hide that this opinion was not based on experience.

Scootaloo slipped in front of them, squeezing around Twilight Velvet's rear end, and slipped her muzzle between Rainbow Dash's knees. Glad for an excuse to look away from Sparkler's withering glance, Rainbow greeted her. "Hey, squirt. Want a bit of me?"

Scootaloo just gave her a look, and Dash opened wide. "Enjoy the view, take a taste."

As Scootaloo began kissing her inner thighs, Rainbow looked to her other side, to where Twilight Velvet was helping Night Light get lined up to mount Celestia. "Yo, Twimom! Where's everypony else? Maud? The other kids? Tempest?"

Twilight Velvet choked on the appellation, but replied, "Maud, not being needed, left. Rarity and Spike are guarding the front, Sweetie and her colt the back. Do you think there aren't enough ponies in this room?"

"Y-y- wow, Scootaloo, have you ever done this before? Gotten frisky with the crusaders?" Scootaloo shook her head without stopping nuzzling Rainbow's thighs, approaching but not quite kissing her pussy. After a moment, Dash glanced around. "So, where's Pinkie?"

Twilight Velvet just shrugged and gave her husband a lick, and he gently pushed forward into Celestia. Rainbow Dash glanced over to Sparkler and spotted her erection. "Want a hoof with that?"

Sparkler gibbered. "Uh." A noise of rearrangement attracted her attention to the bed. Her eyes went to her mother, who looked up and made eye contact with Sparkler as she waited for the colts to settle down: the brothers soon lay side by side on the bed, heads toward the dresser Sparkler and Rainbow Dash were sitting on. The mares settled between their hind legs, and resumed sucking. Derpy never lost eye contact with Sparkler, even her lazy eye close enough to count, for a time.

Sparkler broke that eye contact herself, trying to get free of her fascination, and took stock of the rest of the room: behind Fluttershy stood Starswirl in the corner, discreetly keeping the bubble going. Luna's forelegs were visible over the side of the bed as she lay back and accepted her sister's tongue. Night Light was perched on a footstool, slowly sliding in and out of Celestia. Next to the door, Starlight Glimmer was focused intently on the proceedings, horn alight. Twilight Velvet was close in to Sparkler, her cutie mark up against Sparkler's feet, her rear end offered to Thunderlane to eat out, which he was intermittently able to do between waves of distraction from what Fluttershy was doing to him. To her right on the dresser was Rainbow Dash, Scootaloo still darting in and giving a lick and nuzzling her thighs instead of sucking solidly. And she too had moments of pause, as her rear was planted directly over Rumble's face. And that brought her back to her mother, who was giving Rumble a momentary break.

As Sparkler watched, Derpy locked eyes with her and licked up Rumble's shaft, then gestured with a wing for her to join them.

Sparkler hopped down off the dresser and made her way over to the gap between the brothers lying side by side. Thunderlane lifted his splayed-out wing, and she carefully rolled onto her back in place, ending up lying head-to-tail between them. She looked first to her right where Thunderlane was wincing in pleasure from his girlfriend's attentions, then to the left where Rumble was jerking spasmodically as Derpy let him wind down from edging.

That left Derpy's mouth free. She began crawling over the colt as if to mount him, but then stopped part-way, moved her head to the side, and gave Sparkler's shaft a solid lick. This came as a shock since she'd completely forgotten she had it, she was so wrapped up in watching other ponies.

Sparkler's surprise made her miss Rumble saying, "I'm supposed to come in you. Now good?"

Derpy nodded, and shifted to the side off of Rumble; this put her in a 69 with Sparkler, and she got to work on her daughter. Sparkler looked down her body to the blowjob, but her having a penis was just too wrong in her mind, so she looked away. She stared up at her mother's teats which she had lately been licking, and glanced back towards her mother's tail, and Rumble approaching to mount. Once her eyes' signals weren't being registered, the feeling on her penis was enjoyable, and strong. It may have looked wrong, but it felt very, very right.

Rumble pressed forward and groaned. Derpy's front collapsed forward onto Sparkler; she abandoned the blowjob. Rumble's penis slapped against Sparkler's face, but her attention fixed on her mother's cunt, right in front of her. Sparkler levitated Rumble's penis into position, and he slipped in. Their sex was too close to her face for her eyes to focus on the closest parts.

She stuck her tongue out and Rumble slid against it, his slow inward strokes pushing her tongue to her mother's clit. Then he pushed harder, and the pressure pushed Sparkler's head down and back - she couldn't face it any more. She moved her head to the side and watched Night Light pounding away on Celestia, while Twilight Velvet sat back and accepted head from Rainbow Dash.

She squirmed her head around to the other side, where she could see enough of Scootaloo's legs that she figured out that Scootaloo was sitting on Derpy's shoulders, facing Rumble, where they were presumably kissing. Past that, Thunderlane had Fluttershy pressed up against the head of the bed, kissing her chest and belly frantically, working his way down.

Rumble's motions shifted to pressing upward, allowing Sparkler to look up at the fucking again. His penis throbbed, and then he was still. "Uh, sorry if that was quick. Don't know if I got more than twenty thrusts in."

Derpy shook her head. "It's all right. I have more coming. Bigger uncle, it's your turn."

After a moment, Thunderlane recognized that she was referring to him. He glanced at her, then looked back to Fluttershy. She nodded, and he disengaged from her. Rumble slowly pulled out. A spattering of semen dripped onto Sparkler's face, then more came as his tip slapped her cheek. She straightened her head, looked into his eyes, and opened her mouth.

He leaned forward and let her clean it off.

It tastes… really, really neutral. Like tofu tapioca, or something. I was expecting at least salty, but not really? I guess a little. But that look on his face… I can see what Rainbow Dash meant, even if she was just relaying what she's read or heard, just like I have.

She enveloped Rumble's penis in her mouth for a moment. In contrast to the semen, her mother's scent was strong. Another drop of Rumble's semen landed on the outside of her throat, dropped from her mother.

Rumble pulled away, and as Thunderlane slipped into place, Sparkler leaned forward and gave her mother's vulva a lick. But then she backed off and opened her mouth for Thunderlane's cock. He allowed it to slide in to her mouth. Nothing really new there. Sparkler gently spat it out and smiled at him. He crawled forward and did not need any assistance to begin fucking his older niece.

Once he was in, Starlight let him resume full size. That gave Sparkler the room to move her head, and she took full advantage, sucking on that point of joining, on her mother's clit, on Thunderlane's shaft.

Thunderlane pulled Derpy up with one hoof, pulling her body up against his and tightening his legs, pinning Sparkler's head in place between his thighs. She lost the angle to do what she'd been doing, so she settled for licking Thunderlane's balls.

Given the room to act, somepony began kissing her inner thighs. With her severely constrained view aiming almost directly away, she could only see that it wasn't Luna or Starswirl. She could hear Twilight Velvet coaching Rainbow Dash on eating her pussy, and the sound of Night Light's rhythm on Celestia hadn't let up. A softer murmur was probably Scootaloo talking with Rumble. What does that leave? Fluttershy and… whatever.

She melted into a puddle of enjoyment as whoever that was between her legs made it to the outside of her right labia majora. She spread her legs as wide as she could. Momentarily, a second tongue joined in on her left labia majora. Not sure who the other is. Like I thought earlier, whatever.

Focused as she was on what was happening to her, she was unprepared for Thunderlane's squeezing her head as he came.

The pressure on her head amplified the effects down below and she gasped. Thunderlane withdrew, letting her bring her face back up, just in time to catch a stream of his and Rumbles' spunk spewing out of Sparkler's mother, and onto the bridge of her nose, up across her eyes (hastily shut), and into her mane.

When Sparkler figured her right eye hadn't been touched, she opened it and looked up into her mother's face. "Hey." she said, uselessly.

Derpy licked the closed eye clean as she rocked back and forth gently, pressing her weight down onto her daughter, grinding hips. "Want to?"

Sparkler nodded.

Her mother drew herself forward. Somepony helped them line up, and Derpy pushed backward.

Sparkler realized with bizarre burst of memory that she'd been fucking her mother earlier, too. But before it was just… this ghost in control. And now, she was. She pondered the irony that maybe if the ghost had just finished things right there, then her mother and she could have just gone back to normal afterwards. But with this choice being made, there was no way. But that wasn't bad.

Plus, it felt amazing. Part of that could be attributed to Scootaloo and Rumble having been - and continuing - eating her pussy out. Part of that could be having Luna moaning in ecstasy at her right. But the bulk of it was her mother's cunt around her penis. She wasn't sure how long that was going to last, and it still felt strange and bizarre, but the sheer pleasure overwhelmed the awkwardness.

Fluttershy approached from the side, and Sparkler looked to her instead of her mother's face above her. Fluttershy asked, "Are you fertile right now?"

"What? Uh… I haven't been tracking?"

Starlight commented, "She isn't."

Fluttershy nodded and continued, "Can my boyfriend fuck you? Starlight thinks that'll help attract the ghost better."

"Uh, okay. I can cast Sea Mane's Removal…"

"Don't! We're trying to get your mother pregnant, and it could… do too much."

"Oh, right."

After a bit of shuffling, Thunderlane was lying on his side past her rear end, and with a bit of a levitational assist from Starlight Glimmer, he got his cock lined up.

He pushed. He pushed Sparkler several inches up the bed in the attempt to enter, but her vagina did not open for him. Recognizing the problem, Starlight shrunk him down, and he tried again. Unfortunately, his initial failure had made him lose his erection. Rumble slid into place and Sparkler nodded to him. He slid right in.

Sparkler's bizarre displaced feelings from her penis took on a new form, as she attempted to interpret signals from her vagina. It felt if she was un-pooping his penis. She clenched her anus… yes, Rumble had not gone in the back door - she was just confused about her body layout. As he gently thrust and Scootaloo licked where they were fucking, Derpy matched their rhythms, moving strictly contrary. Then she sped up for a moment and had a little bit of a phase lead - she pushed back just before Rumble pushed in, and pulled up just before he pulled back.

Sparkler heard an argument elsewhere in the room, but paid it no mind. This was heavenly. She heard a loud creaking as Luna got up, but didn't register that that was what the sound was from. She did register that Rumble paused in fucking her. He even pulled out, and she let out a deep breath.

She finally listened in. Starlight was saying, "You didn't object to anything else going on here. Lots of mares on mares…"

"Yeah, but…" Thunderlane whined. Derpy stopped, impaled fully, and looked over her shoulder at her uncles.

Rumble said, "You haven't been affected long like us or hard like those two, so you're still straight. Makes sense. So you go in front. I'll take up the rear."

"That's my butt you're talking about!"

"But you don't have to perform, just let it happen."

Rainbow Dash taunted, "After fucking your niece with your brother's sperm in her and getting prepped by your grandniece, you're worried about your butt. Sheesh, what a pussy. I mean, you'll be balls deep in your grandniece at the time. It's not like you need to worry about our thinking you're gay."

Fluttershy added, "Not that that would be a problem. If you were bi, I mean. Gay would be a biit of a problem, since I'd like to keep dating you and if you were gay you wouldn't want to. But I know you aren't."

Thunderlane nodded. "Yeah, I'm not. I guess on top of everything else this isn't so big. Especially what everypony else has done. Is doing. All right. Sparkler, take a break. Starlight, make me little."

Thunderlane was momentarily much smaller. Derpy moved a little up and down on Sparkler before pausing again to let Thunderlane line up sideways behind Sparkler again. This time Thunderlane slipped in easily. His penis felt much like Rumble's had - at least, until Starlight released the spell and he returned to full size.

That… was a major stretch. Sparkler felt quite uncomfortable, and tapped him with her rear hoof. He stopped, and softened some, which helped.

Then Rumble got into position. His brother's butt was over the edge of the bed, which was a bit high. Starlight moved over the stool Night Light had used to mount Celestia. Thunderlane grunted, and there was some fumbling.

Rumble finally got a good angle, and with some help (including a lube spell from Night Light) and encouragement (though that was mostly aimed at Thunderlane), he managed to get into his brother.

The rhythm was hard to settle down. Eventually, Rumble drove, starting a wave - he'd push Thunderlane, who'd push Sparkler, who'd push Derpy. Sparkler noticed that with the distractions, she was getting a little numb. It was going to be hard to come, perhaps.

Starlight carefully warned them, "This is going to be the hard part. The ghost is going to leave you. Keep going anyway."

Sparkler wondered what that would imply until Rumble came in his brother. The smoke cleared so suddenly she finally noticed that it had been clearing for minutes. Then Thunderlane paused.

Starlight growled, "Keep going."

Thunderlane hesitantly resumed, and picked up the pace, and after half a minute, came in Sparkler. All of a sudden, Sparkler's mind cleared further, and she no longer thought all of this was her fetish. It was just a weird thing they were doing together against all rules.

She looked around in a panic until she found Celestia's face. That warm, comforting, approving face. Sparkler gathered her wits and fucked her mother with the urgency the task deserved.

Her mother came, hard, screaming, flailing, flapping. And at the last moment before Derpy collapsed and ruined the angle, Sparkler followed her over the edge.

Her cum mixed with her uncles', and she could feel something snap into place. The ghost was there, near the tip of her penis.

Derpy rolled off of Sparkler. "Oh Celestia."

"Yes?", asked the invoked individual.

"Thanks. That was good."

"You're welcome, though I think somepony else deserves more of the credit."

Starlight coughed. "We're nearly done."

Thunderlane pulled out of Sparkler as he asked, "There's more?"

"No more sex. We need to go for a walk without cleaning up. Escorts are fine. We don't want to attract attention, so we'll leave the princesses behind?"

Sparkler felt the semen trailed across her face, and dripping from her cunt. She rolled around to face Starlight, and asked, "You want me to go out like this?"

"Precisely. It's late evening now, and I'll make sure you aren't brightly illuminated, and we'll all surround you while you're foal-sized."

Sparkler coughed. "What happens if we don't?"

"Ghost doesn't get glued down. We have to do it all again."

Sparkler groaned and got up. "All right."

The walk was very straightforward. Sparkler barely saw anything through the dense formation. She noticed Spike put a claw gently across her shoulder, walking alongside. She felt peculiarly dizzy, drained. She focused on that claw, until the walk was over and it wasn't there anymore. She was in the kitchen. For a minute, all she could do was blink. Partway through, she noticed she didn't have a penis anymore.

But her mother gently got her moving, guiding her up. She was surprised to find as she passed by it that her mother's bedroom was spotless and did not smell at all. Princesses as maids?

She headed straight to the bath, and her mother went in with her. They washed each other simply, with neither a hint of sex nor awkwardness nor shame. They went to sleep in their own beds. Starlight dropped by to drop off Dinky, who visited them both and asked how it went.

Sparkler considered this very carefully in far more detail than she could report. She finally said, "It was good."

Author's Note

There is more - the story is not done - but I think this is a good point to set it aside for a time, so I can get the shape of the next arc nailed down, and work on other stories.

So as not to give the wrong impression of how things have been left, I'll call this story done and what follows from here a sequel. After all, the avalanche itself is over.