Ocellus was shown out the back of Silly Filly with a completely inconspicuous and sealed shopping bag attached to her saddlebags, and immediately turned west towards Sandbar's neighborhood. It was still morning; Silly Filly hadn't even been open thirty minutes, and she had wanted to get her supplies early. It wouldn't have been fair to deplete Sandbar's stash for the whole week when his bits paid for most of it. His parents had initially gifted him the large foal furniture and initial stock of diapers and changing supplies for his birthday, but had told him that replenishing everything was his responsibility. So far, her feedmate had done so by working part time at Fluttershy's animal sanctuary, and he had also taken a summer job at the Canterlot Aquarium.

She turned down Sandbar's street, and saw a small wagon out front of their one story home, and saw Sandbar with his parents and little sister out next to it. She trotted up to see them embrace each other.

"Alright, Sandbar. Be safe, be responsible, and have a good time." Beachcomber said, and then saw Ocellus come up.

"And you too, Ocellus. Have fun, be safe, and keep an eye on each other." High Tide said.

"I will, I promise." Ocellus replied as they tossed the last of their luggage into the back before helping Coral into a booster travel seat up front with a good view of the road before both of them stepped into the harnesses, and they were off to the train station, leaving Ocellus and Sandbar standing in front of his house.

"Alright," Sandbar began. "An entire week to ourselves. Where should we begin?" He asked.

"Well, I bought enough to last me nearly all week, but now that I'm thinking about it, I think I'd like to spend some of the time looking after you as well. After all, a little colt like yourself needs to be looked after, don't you agree?"

Sandbar lightly blushed and nodded, wondering what Ocellus had in mind. It was Saturday, and Silverstream and Terramar wouldn't be here until later in the week.

"So, in that case, let's get you to your room. You look underdressed." She told him. He began to make his way up the front walk, with the changeling in tow. She was currently surprising herself with how... Authoritative she was sounding. She had first arrived in Equestria overly shy, and she had grown so much in the past couple years, and she knew for Sandbar to truly enjoy the next week, she would have to take charge for at least a part of their week in this house together.

The two of them stepped through the front door and immediately headed down the hall to the stallion's bedroom. She removed her two packs of flower-patterned disposable diapers from her saddlebags at the base of the changing table. They were clearly distinguishable from the stacks of Sandbar's fish and sea life colored ones. She watched as the stallion put in an early lunch into the food dishes of his two pet turtles, and then turned back to her. He stepped up to the right end of the changing table, and with a gentle nudge from her snout, he climbed up, laid down on the plastic mat, and rolled over onto his back. Ocellus grabbed a folded diaper from the shelf, a stuffer, and a bottle of foal powder, before climbing the steps on the right side that provided easier access.

"I know we want this spring break to be a week of fun. But it should also be a week of more healing, for both of us. So to start out, I have a story to tell. When the changeling hive underwent the metamorphosis, there was a lot of uncertainty. A lot of us were wondering how to start over. Thorax told each of us that our first priority should be to love yourself. So that's what we're going to start with." Ocellus told him as she got the fresh diaper unfolded, put the stuffer inside, and got it placed under him. Sandbar's raised an eyebrow when she didn't go for the foal powder next.

"Well, Ocellus, I'm pretty sure I've got that part figured out." Sandbar told her, noticing that she had reached back to the shelf to get the small bottle of lube.

"Do you?" She said with a smirk and raised eyebrow, before a flash of light surrounded her as she let her transformation magic course through her. Sandbar blinked, and where the changeling stood over him a second ago, now stood...

Himself.

Sandbar swallowed as the transformed 'Ocellus-Sandbar' applied lube to her very erect stallion's cock, but it wasn't quite flared.

"Been awhile since I've had the chance to use one of these..." Ocellus said with Sandbar's voice as she rubbed in the lube, before applying a dab to his sphincter with the tip of her hoof.

Knowing what was coming, Sandbar spread his hind legs as best as he was able, as Ocellus got herself lined up.

"Don't worry, I'll remember to go slow." Ocellus reassured him.

"Don't fret too much, I don't think it's been that long..." Sandbar said as he felt the tip begin to prod at him. He did his best to relax, and the unflared tip slipped in. Sandbar remembered to focus on his breathing. It was familiar, but still a bit new. A griffon's phallus was a different sensation than a stallion's. And this one was, in a way, his very own. Ocellus continued to steadily push in, and once the medial ring passed, it was smooth sailing. A few moments later, she felt her balls touch his dock, and Sandbar slowly breathed out.

"Such a good little colt, taking me all the way."

Still versed in technique from the other times she had taken Sandbar as a masculine form, she slowly pulled out, not quite to the medial ring, then pushed back in, a bit faster this time. Each thrust made the clean diaper underneath the Sandbar crinkled. As they were the only two in the house, neither of them had to worry about noise levels, and began to moan and whine as their coitus continued atop the adult changing table.

Ocellus-Sandbar began to exhale green mist as her thrusts began getting a little more erratic, and her charge began to feel her flare inside him.

"Hope my big foal is ready...!" She said, gritting her teeth. After a few more haphazard thrusts, she hilted her stallionhood into him just as she began to unload the seed it had in store.

Sandbar watched Ocellus' look of ecstasy as she gave soft thrusts with each additional squirt of cum she deposited into his colon, along with the glowing green mist that was now beginning to surround the changing table. Finally after about ten seconds, she was done... Or so it seemed. With her last squirt, she let out a long breath, nearly enveloping Sandbar's face with the misty, magical energy.

"Ahhh... What a good boy. But I don't think we're quite done yet." Ocellus told him, grabbing the bottle of lube again, opening the cap and tipping it over Sandbar's erection, letting the lubricant dribble out over the dark-skinned phallus. After a moment, she closed the small bottle, set it aside, then massaged the lube all around the stallionhood that wasn't quite flared yet.

"I doubt we'll be able to get a diaper around that big thing, so let's fix that," She said, climbing up onto the changing table, and began to climb over Sandbar, feeling his tip brush against her own semi-erect cock as it rubbed against her stomach, sliding past her form's balls as she lined her sphincter up. Her chosen words were merely teasing; he had been changed while erect plenty of times; by her, by Gallus, and by his parents, who did their best to just tape up his diapers a bit tighter when he was excited. While he would have been perfectly happy to get off in a nice clean diaper, it seemed that Ocellus had something else in mind as she slowly pressed down. They hadn't done anal since before the breakup, but it wasn't exactly her first time either, and it looked like Sandbar was going to find out precisely what he felt like back there as her doppelganger form continued to slowly take his cock up the backside, her stallion cock still dripping the very last of the seed she had deposited in him moments ago. She passed his medial ring, and finally bottomed out, slowly exhaling more green mist. She rocked back and forth a few times, then started riding him, moving up and down, never passing the medial ring, keeping the majority of her boyfriend in her at all times.

This was Sandbar's first time being in another stallion, and he was surprised at how tight he felt. A part of him wanted to start thrusting up, but he also wanted to let her do her thing in this form. But as he felt himself begin to reach the peak, he couldn't help but give a couple bucks upward. Ocellus also knew the inevitable was fast approaching as she felt him begin to flare inside her.

"Ocellus... Ocellus... Here I come!" He did his best to warn her, and for her part, her doppelganger form slid all the way down, feeling his balls press against her dock, just in time to feel him twitch and shoot his seed up into her.

Or, him. Or whatever.

Sandbar gritted his teeth as he was milked of his current buildup. When he went limp, Ocellus knew he was finished, and slowly lifted herself off of her.

"There we go. Now we've both got a little something up there." She said with a smirk as she climbed down to the stairs at the end of the table, grabbing the bottle of foal powder, giving his nether regions a quick dusting before bringing the front of the diaper up, smoothed it against his belly, brought the back wings around, and taped it up. With that done, Sandbar leaned up into a sitting position, and traded places with his feedmate as she flashed back to her default arctic blue form, and took her place on the table, laying on her back.

As Sandbar opened up one of her new packages of diapers, pulling one from the tight packaging and fluffing it up as best he could as he unfolded it, he wondered just what else she had in store for this week...

Author's Note

Thanks for reading this update, more to come!