The animal you brought back with you was a squirrel monkey. The small creature cost you almost all of your savings -- 5000$. But it was worth it. You needed an animal that was legally yours for this change to work properly. Besides, there are probably some interesting ways you could make that money back, thanks to the ring. You could swap with a celebrity, could preform a kind of flawless plastic surgery that would have no side effects, even open up a dusty back-alley shop dealing in "curses". The sky is really the limit, you think. But for now, you're focused on the changed Monkeyboy on the other side of the door.
The squirrel monkey that you chose to do the swap with was a small, cute little thing with gray-brown fur and beady black eyes. The primate was scarcely a foot long, maybe two or two and a half feet if you counted the tail, too. The monkey, whose listing said he was a male named "Peanut", was a mostly friendly little thing. When you went to the sanctuary to sign the paperwork, the creature crawled onto your arm and perched like a little gargoyle. Not that the monkey needed to be friendly. He's just moved up in the world. People are going to treat him like a human being now, thanks to the ring. If you set him free, he'll probably be fine.
The man in the other room, though... You open the door to check what other change has affected your Monkeyboy. When you open the door, the apeman formerly known as "Brock" is grabbing at his head. You see instantly that his human ears have been switched with white and gray squirrel monkey ones that stick up in points on either side of his face. They've resized themselves proportionate to his head, making them quite big compared Monkeyboy's old human ears. He looks rather cute with those, you think, although there is a disjointed look to his human features, his monkey ears, and his apish feet. He's like a mostly finished puzzle with pieces jammed into place from other sets.
Monkeyboy stares at you angrily, flailing his hands towards his face. "What are these about? I thought you JUST said that leaving me all messed up didn't make sense?!" You open the bedroom window and unlatch Peanut's cage, letting him scurry around the room. He is blissfully unaware of his little human ears where his old ones used to be. He climbs up on a nearby lamp and perches on top. You leave the smaller monkey be and sit down next to the big one on your bed. "No, Monkeyboy, I just meant we had to change some things around to make the situation a little more fun!" Monkeyboy cringes. "Don't call me that! Please, can't I just change back?" You scratch him behind his fluffy new ears and stroke his short hair. "Look, I'm magic right? Just think of this as a vacation. You were having so much fun exploring your sexuality with me the past couple days, and I'm just helping you experience new depths. I bet you're turned on, aren't you?" You slide your hand down to the small of his back, tailless for now. That might have to be next on your list, you think, bringing your attention back to Monkeyboy's face. Your new pet just shakes his head in confusion. "I mean, yeah, but..." You interrupt before he can talk himself out of it. "Well, great! Then just trust me. You can be back to normal in a while, just enjoy a little bit of roleplaying with me before then," you say, sounding confident. You're not really sure if you can reverse all of these changes, but Monkeyboy will never go along with this if he knows that. It shouldn't be too hard to make him a full-blown human again, but whether or not he can ever be the old Brock again is another matter...
Monkeyboy cuddles into you a little with a smile. "Alright. I guess I am having fun, sort of. If you can change me back, I'll try to play along a little more." You grin, feeling a few extra wrinkles in your smile. Being a little older is fun, but sometimes it's hard to forget these weird little differences in your body. "Great, Monkeyboy. For starters, let's..."