I had an idea for my own version of this story, does this sound interesting?
[pasted from discord]
So my version of the Horse Costume idea is; a Gay teen, drama enthusiast. (OK, lots of moving parts to fit the scanario in, so bare with me). Gay teen, good actor, takes his drama grades seriously. Football Jock, bound for good things, Straight, one or two years older then Gay teen, bound for signings or sports scholarships after he graduates.
Story starts Jock’s dad, jock and headmaster in a meeting. The jock tried to “skip a year” by taking on a year and a half worth of study, to finish what would be three years study, in two years, to get out of education quicker and get on with his—no doubt—successful life as a sports star.
He’s failed one of his subjects (in this made up, fictional blur of highschool, college and university,) and his only option is to indeed “do” the third year, and the Jock Dad and Dad are like “for one module?!” And the headmaster is like "There is literally nothing we can do, we’re already bending over backward to push three years study into two for him, it’s just one of these things, he’ll just have to do his final year. All parties exhausted, Headmaster remembers the drama class have not put their show on yes, and the show itself gives enough of a the modules grade %, to have him pass if he does well, if only he has some token role. Just anything to get the last pass he needs.
Gay Hero (Reserved, intelligent, a little socially awkward, occasionally bullied, not popular outside of his immediate close circles, but very popular in those circles) is practicing his lines. Jock walks in Drama teacher says “Jesse?” (lets name him Jesse)
“We have a change in your role… you’re character will now be a centaur, Mason will play your back half.”
“it’s the exact same role, meet up, learn how to walk in unison with him grabbing your waste, he needs a pass and you’re his knight in shining armour, lets be honest; you’re sitting on a A anyways unless you both have a aneurism on performance night.”
and that’s where you introduce the kinda, maybe he has a crush on hot athletic types, his worries about this jock literally hugging his crotch at all times, his identity as “the actór” of the school, how unfair it is, etc, etc," (edited)
[Bad middle part of the story where Gay dude and Jock hate each other]
[Magic twist where magic happens]; Jock gets melded to Gay dude, for say a week or two; One digestive system, four legs, The gay dude becomes an actual centaur with the jock’s head shoulders and arms converted into his new “subconscious gut.” Gay dude has lost his dick and balls, but the Jock’s dick and balls are enlarged and contain both teen’s libidos. An extra twist will be the jock’s father at first demands to know why is son hasn’t come home. When the hero explains what happened, and that it’s impermanent, the dad is like… “So he’ll still get his grade, and he’ll transform back after?” and the hero is like “yep” and the dad is like “well, OK, if that’s what it takes, but you have to keep up his cardio and fitness.”
and the gay dude basically has a fortnight being a centaur, with access to most of the jock’s body and enlarged dick and balls between his back legs. He can’t reach to masturbate so he has to do stuff like get people to help him masturbate, of find bottoms experienced enough to fit him.