Rainbow Dash wakes up groggily, opening her eyes as the sunlight bombards her eyes like lasers of pain. Her head compresses in pain like a ring around her head trying to squash her brains out. She closes her eyes as she rubs her head with her hoof. She sighs as she feels a small presser to her right rump. She turns and slightly opens her eyes to see Joe napping against her massive rump. She closes her eyes and chuckles as she tries and think what happened.

"I was in heat and couldn't take it anymore. So I decided to pay Joe a visit with rainbow socks... not my best choose in sexy wear. We then started to have fun, then I started to grow and.. and..." Dash's mind goes plank as all she remembers is bliss and pleaser. "What happened? I must have had a few growth spurts. I am the same size as the tree while sitting." She feels Joe stir against her plot. She opens her eyes slightly again. The sun started to not hurt her eyes as much. Joe was now laying faced towards her with a hand sliding across her giant cutie mark. He was looking at her socks in slight confusion.

"Hey down there, how you doing?" Dash whispers, her ears ringing from her own voice in her head. Joe looks up and smiles at her.

"How the hell did the socks not rip?"

"I found out that anything attached to me grows with me," Dask says, closing her eyes and trying not to throw up her stomick.

"That explains why you can grow me when I'm touching you," Joe says, slightly pushing his hand into her butt. She shivers at the touch before opening her eyes. The fog and pain now cleared from her mind as something els starts to bug her.

"So how was I in the middle of heat?" Dash asks, laying her head down on her front hoofs and turning to look at Joe.

"You were.... strange," Joe says hesitantly. Dash rases an eyebrow at him. "You called me hunny." Dash opens her mouth and her eyes slightly widen.

"Oh.." Dash simple says.

"Ya.. I also found you have an interesting kink," Joe says with a wicked smile as he removes his hand from her rump. Rainbow whins in her head when he removes his hand from her. Her body starting to slowly feel strange again.

"What's going on with me?" She thinks as she moves slightly uncomfortable. "What did you find out about?" Dash asks slightly worried.

"This," Joe says, slapping her ass, causing it to giggle as Joe recoils in slight pain from the skin to skin hit.

Dash's eyes go wide as a moan forms in the back of her thought. She lets out a high-pitched moan loudly slips through her lips. Her body now feels like it's burning up on the inside. "Shit! the spell must cause more then one heat wave to!" She thinks, but it's to late. Her body and mind was now taken over by the great feeling of Joe's hit. Her body shivers at the idea of having Joe's dick in her again. Her slit getting wet at the want of a dick to cum inside her. She now had little control as her mind fluids with multiple ways to fuck the little human.

Joe looks at her confused as she stares off into space. He stands up and waves his hand in front of her giant face. "Equestria to Dashie?!" Dask blinks a couple times before a cocking smile wider then normal spreads across her face. Her eyelids lowering half way down as she looks at him with lust. Joe's heart sinks as he realises one of Twilights' warnings.

"With a spell we know little about, we have know idea what is could do to a living thing. So if Dash goes into heat before we remove it, then make sure not to do anything to sexy after, or els it might trigger another wave of heat. It might be even greater then the last to. It might even cause Dash to not be able to stop her self, so please be careful" "Thanks for reminding me after I fucked up Twilight!" he yells at his own flashback as Dash stands up.

She stands almost twice the size of the apple trees around them. "Shit," The two think at the same time as Dash turns around. She shows off her magnificent giant ass to Joe. Her rump is the size of a barn. Her rump swaying in the air, slightly giggling with the air pushing against it. She then lowers herself down hard and sits on Joe. He was in complete stun before the blue ass came down onto him. He was now squashed between her giant rump. His back is flat against the ground with his dick hardening as the sensation of her soft, furry rump against his skin.

Dash smiles and flexes here rump mussels, squishing him between her ass cheeks. "Damit! I hope he takes my apology after this," Dash thinks as her body speaks for her. "Joe, I think you need a little help from everyone with this magnificent mare sitting on top of you!" Dash's voice booms like the royal canterlot voice Luna used. Applejack from her house sees the giant Dash. She looks nervous before thinking, "I'm gonna get Twi," Applejack runs off as Dash continues to toy with Joe.

"So is this what the heat actually feels like?" Dash thinks as her body is covered in magic. Her tongue hangs out as her eyes roll back. Her body shooting with pleaser as the magic slides down towards Joe. The magic felt like Joe's hands sliding down her body and past her rump. "But dam! dose it feels good to be this big,"

Joe grunts as the magic surround him, causing him to grow underneath her rump. His body forces against her cheeks as his dick starts to scrap against her butt. He stops growing as his head pops out the top of her ass with his dick slightly penetrating her slit. She shivers as a deep moan shakes the area around them.

"Dash?!" Joe yells in concern. "You ok?!" Dash scoffs as she turns around to look at him.

"I feel great! I'm the best fucking mare in Equestria right now!" Dash says. "But I would feel better if your dick was inside by big ass, so lets see how many everyone's it takes to get you as big as me." Dash shakes a bit as the magic washes over and down her body to Joe. "Wait, if I'm still here, then who is controlling my body?" Dash thinks as Joe moans. His body pressed against her rump causing her to moan. His dick now slides into her slit, causing her to let out a sigh of pleaser.

"Everyone, everyone..." Dash keeps saying it as Joe keeps growing. His dick sliding into her slowly as his body starts to grow to big for her to sit on. Joe moans and grunts as the walls of Dash's slit clamp down on him as she seems to get smaller. His head hits a tree, causing him to reposition. That's when he realizes he's big enough to move her again. He smiles and grabs her plot, one big blubbery cheek in each hand. Her wings spread out, causing high winds to blast out in all directions, shaking the tops of the trees as she squeaks in surprise.

"Is he going to do what I think he's going to do?" Dash thinks as Joe pushes her off of him. She lands on her feet, causing a few trees to fall over from her force. He quickly stands up, now quite a bit taller than her. Dash's eyes widen as her ears flop down to the sides of her head. "Know you get a fucking moral you slut!?" Dash yells at herself as she tries to run, but is grabbed in the sides by Joe.

He sits down and places her on his lap with his dick between her butt cheeks. His dick was now way too big for her, in fact, it was almost the same length as her.

"Please, no.." Dash pleads with Joe. "This is what you get!..me?.."

"You'll grow a little so you can be my personal fuck toy so I can get my Rainbow Dash back," Joe says. "Everyone," Dash shutters as she grows again. Her butt grows wider and thicker as she gets taller. She is now up to his chin.

"I'm going to feel this tomorrow," Dash thinks as she is lifted up and over his dick. He slowly slides her onto his dick, causing her to shiver and moan with every inch of his big throbbing dick that slides into her. "At least it's going to be pleasurable,"

Twilight and Applejack teleport in to see the two giants about to have sex. "You were not kidding when you meant they were hyper grown," Twilight says in awe while looking up at them as Joe slowly slides Dash all the way onto his dick. Twilights wings flare out and wak Applejack in the face.

"Watch where you spread those wings of your's!" APpljack yells as Twilight as she brushes her wing away from her face. Twilight bashfully pulls her wings down as Dash lets out a high-pitched moan. The two look up to see the par growing again. Dash's plot starts to destroy the nearby trees with its size alone. "We need to stop this before they kill the entire town?!" Applejack yells at Twi.

"I know, I'll see what's going on," Twilight says as she casts a spell on her. She starts growing bigger as Applejack moves backward. Twilight grunts and lets out little moans as she grows taller. Applejack runs away to a nearby tree as Twilight becomes the same size as Dash and Joe. The two see Twilight as Dash gets computable on Joe's dick, rubbing her rump into his lap.

"What's going on?" Twilight asks.

"Dash has gone bat shit crazy with lust and I'm about to fuck it out of her," Joe explains.

"Nu-uh," Dash says, crossing her arms and pouting like a little filly. Joe lightly thrust causing Dash to melt into Joe's arms that are wrapped around her body.

"See,"

"I do, just give me a sec," Twilight says as she casts a spell on Dash.

"Dash, you in there?"

"Twilight! is that you! Thank celestia! Some slut has taken over my body!"

"That's you Rainbow. It's just the sex drive taking complete control. You'll stop at nothing now to have sex. I think the spell cause this and.."

"Please don't remove the spell!" Dash interrupts Twilight, causing her to visible move back. Joe and Dash look at each other and shrug.

"I have to, or else this might happen again next year, or maybe sooner," Dash's mind goes silent as she thinks about it.

"Please find a way to make the spell not do this and reapply it later,"

"Deal, now I'll let Joe fuck the living tarderis out of you and then we can safely shrink you back down and remove the spell," Dash mentally nods as Twilight starts shrinking. "Fuck her, then well shrink you two and remove the spell from her before we can find something safer," Joe knods as Twilight returns back to normal.

"So?" Applejack asks, walking up to her.

"Well wait until after Joe literally fucks the slut out of Dash and then we can return them to normal and remove the spell so this doesn't happen again," AJ smiles and nods as the two sit down and chat as Joe returns to his prize.

"How about you don't and we return back to normal size?" Dash asks, looking up at Joe. Joe smiles and shakes his head no.

"I want my Dashie back, and I'll fuck you out of her," Joe says before raising her up and trusting her down as he pushes his hips up to meet in the middle. His hips met with her rump, causing waves to vibrate up her butt and body. She shakes and moans as Joes thrust, using her as a sex toy. "I will say everyone must be enjoying the show," Joe says, looking down at Twilight and AJ. Twilight's wings are fully straight again as she plays with herself. Applejack shook her head in disaprovel. Dash melts into him, now unable to move as she spasums with pleaser.

"Oh dear Celesti, I need to remember to have him dominate me more often. This feels amazing!" Dash thinks as the haze sets in and her climax starts to build.

Joe thrust faster as her rump grows and stretches. Her plot now as big as the smallest mountain. She now sits at the same height as he is. He starts to build up as her butt hitting against his legs start to become too much. He grunts as her vice-like slit grips down on him. He slides her down hard and hugs her into his body as he cums into her, but non of it goes into her as it magically disappears. The two relax as Twilight's horn stops glowing.

"Din't want another growth spurt," Twilight thinks as Dash looks up at Joe with a genuen smile.

"Thanks for the help big guy," Dash nuzzles into him.

"You're welcome my angel," Joe says, hugging her as the two starts to shrink back down.

Author's Note

This story has been my favorite so far to right and might be the last of Dash for a bit as other ponies start getting into the shenanigans.