Sky let his head sink into the soft pillow as he slowly exhaled, his breath exiting around the pacifier he held between his teeth, taking in the euphoria of his current situation. He laid on his back in his crib, front hooves magically restrained towards the top corners of the mattress, and his diaper had been positively dampened by his husband's morning relief, the stench of which was beginning to reach his nostrils, and kept him semi-hard beneath the warm, swollen padding around his nethers.

'Wonder how long he'll be gone this time.' The pegasus thought to himself, fairly certain that around ten minutes had passed since Cobalt's departure. The bedroom's sole clock wasn't visible from the crib, and this was done on purpose, as the crib also served as his timeout space, and it was none of his business how much time had passed. Sometimes Cobalt was only gone for a half-hour, sometimes he was out in town until nearly noon; when he was restrained in the crib, he was never told, and that was part of the fun; role play was always more interesting with the occasional mind game.

Any newbie to bondage might be a bit worried about being restrained for an unspecified time alone, but the couple had worked this out; safety was always their top priority no matter whose day it was to play. The magical restraints that kept his front hooves in place allowed for a few inches of movement in any direction, and could also allow their places to be alternated, allowing Sky to roll over onto his stomach should he need to. If he absolutely had to get out of the crib, the unicorn had taught Sky a spell-breaking incantation, exponentia ruptor, that would immediately dissipate the restraints upon the words being spoken in proximity to them. To guard against the pegasus forgetting the words in a panic, Cobalt had expertly engraved them into the top rail of his crib, where they could easily be seen.

The restraints kept him mostly in place, true, but mostly it was to keep the mischievous pegasus' hooves away from his diaper. If he was really set on getting off, he could simply roll over and grind against the mattress, but not only would that end today's fun all too early, doing so without Cobalt's permission would also get him a blistering spanking, especially on a non-hybrid play day. For now, he was content on behaving, occasionally and softly squeezing his legs together to feel the squishy bulk between them.

But it wasn't too long before his bladder too signaled that enough was enough; the night was over, it was time to empty. Not only that, but the Super Ultra Extreme Awesomemazing Nachos Supreme from dinner last night had also completed the course through his digestive tract as the pressure in his bowels began to increase, and it wasn't going to wait for him to find a bathroom; he had been role playing with diapers for all of his adult life, and his brain had figured out long ago that the crinkling garment around his waist was an acceptable place to relieve oneself.

Not wanting to leak, his semi-hard stallionhood increasing the risk of such if he were to let go while laying on his back, he pulled at the magical restraints, using the spell's firm resistance to pull himself up into a half sitting position, took a breath, and let it out, along with the urine in his bladder. His 'Foal At Heart' diaper swelled even more as it accepted Sky's wetting along to join Cobalt's. When the stream died down, he let out a few more weak squirts, gave it a few seconds to fully absorb, then slid back down to his laying on his back, sinking back into the pillow once more.

This was bliss.

Sky wasn't sure what he had done to deserve Cobalt, but the pyrotechnic unicorn was everything to him. They had been happily married for just about half a year, and engaged for three years before that. Even before that, when they were dating, when he sensed that they were really starting to connect, Sky dared to tell him about this side of himself, and Cobalt accepted everything he had said without a second thought.

"You don't pick and choose parts of somepony to love and accept, you take all of it." He reassured his coltfriend at the time.

It was these words that were cemented in Sky's heart, and truly made him believe that Cobalt was the one for him. To be fair, it was much more than their kinks and fetishes; they loved cooking together, going for hikes, and shared almost all of their hobbies. The unicorn wasn't without his kinks or quirks, either. Soon enough, he had opened up about his micro sizeplay and submissive pet side. Sky had been so eager to show him his acceptance that he had quickly gone out and bought a blue collar and leash, complete with an engraved, heart-shaped nametag with his name on it.

It might as well have been an engagement ring. For both of them, having a partner to role play with was one of the best things about life right now. Of course, with Sky's two part time jobs of weather pony and columnist for Ponyville Daily, and Cobalt's as a pyrotechnician and wagon repair, the pair usually only got to set aside a day or so a week, so they went on a set schedule; ageplay for Sky one week, pet play and sizeplay for Cobalt the next, then to mix things up a bit, they incorporated elements of both for the third week, what they coined 'hybrid' days.

Their mindsets changed from time to time, too. Sky, ever the adult foal, got it in his head one time to ask Cobalt to wet his diaper for him, and the unicorn obliged, and the act quickly became part of the pegasus' mindset. Cobalt, happily playing the part of a loving foalsitter, had to be gradually coaxed into adopting a considerably more disciplinarian angle with Sky when he decided to be a brat. He initially shied away from making the pegasus' flanks burn red, but Sky reiterated that that was the point. Now, it had gotten to the point where Sky had to think twice whenever he set out to deliberately misbehave for his dearest, because while the unicorn had a healing spell ready for bruised and burning flanks, he was no longer above delaying the application, letting the pegasus think about what he had done.

Cobalt was no different; he also had quirks about his 'pet' mindset that he had to ease Sky into. There were days that the unicorn wanted to be nothing more than an adorable, loving lap pony. Then there were times where he wanted Sky to pin him to the floor, put him in his place, and pick an end to shove his throbbing stallionhood into, and often wanted his husband to get physically restraining in the process. It started out awkward at first, but as the two switches got more comfortable with each of their submissive and dominating sides, they wouldn't have it any other way.

After a few more minutes of pacifier suckling and light leg wiggling, his bladder empty, now it was his bowels' turn for some attention. The pressure continuing to build, Sky gazed back at his restrained hooves, and rolled over onto his stomach, the glowing points of light that held his hooves allowing his limbs to switch places. Then he raised his back half up, and allowed nature to take it's course. His tail hitched up, and he began to push. His poop began to come out, and soon met the resistance of the diaper, and it began to spread. The sensation never got old to him. It was warm; almost too warm at first. It was the ultimate expression of foaling out, the biggest sign that he was helpless and needed someone to look after him.

Thirty seconds later, the deed was done, and he slumped down onto his stomach, the fresh, warm mess in the seat of his diaper pressing up against his balls. It was almost enough to make him drool. Feeling how full his diaper now was caused his erection to come to full attention, and Sky knew that he wouldn't have the discipline to resist humping against his mattress if he didn't roll back over. So he did, resting his head back on the pillow as the stench of his now stinky diaper wafting up to his nose.

He hoped Cobalt wouldn't be too long with his morning errands. After all, this was his day too.

Author's Note

Hope you're all enjoying this story, even if these chapters are a bit short. Regardless, thanks for reading!

Also, a special thanks to the downvoters; who continue to reaffirm what I've always believed about their kind.