There's a bright flash that surrounds and obscures your naked friend, and when the flash clears, there's a horse standing there. You blink, the horse is still there: brown fur glistening in the sun, huge face, a streak of white fur down the middle, a pink nose. The large horse shakes itself and looks around, gives a startled snort as it looks behind itself, then looks down, and starts to frantically start clopping his hooves in place.
"...Keith?" you venture, not quite believing your eyes.
The horse swings back his head to stare at you and gives a loud whinny.
"Hey, dude! Calm down."
The horse snorts and shakes his head, his mane whipping about, as if to say: Fuck you, dude! I'm a fucking horse, I'm not going to fucking calm down.
"Dude. Seriously. I didn't know that would happen, give me a break here. Just hold still a moment. I want to make sure I'm not having a drug trip or something. You going all wild stallion on me isn't gonna help, OK Keith?"
The horse settled, begrudgingly. You walk around the horse, still confused how this could be real. Damn, your friend had turned into a horse before your eyes with these magical keys. How cool was that! You paused to admire the horse's swishing tail against a massive ass, and snickered. Keith looks back at you and gives another angry snort.
"Hey, sorry. Just admiring the goods." You a big wink. "At least it appears you're a boy horse."
Keith gives what can only be described as a horsey grumble as he clops in place again. Then, almost on cue, you note his horse penis unfurls and lets loose a long stream of piss. Keith lowers his head and gives another snort, and you can tell he's pretty much saying: Kill me now. You restrain yourself from making a "piss like a racehorse" comment, and then vaguely wonder how Keith would do as a racehorse. If Keith retained half the lack of motivation and stamina he did from being human, you supposed not that well.
You can't help but laugh again at seeing your friend in this position, but you suppose he'd been put through enough at this point. You figure you better turn him back before he adds some horse manure to the sidewalk too or someone comes by to ask why there's a horse here.
You look at the key and figure out how to work this thing. Seems pretty random so far. Even if it doesn't work, might be cool to see what else these keys will do. You move to hit the unlock button to see what will happen next...