Contract the ox demon.

Why this needs to be done privately is odd, but you might as well do it. The girls changing room is at least secluded and won't result in a ton of people bothering you. Nobody looks to be around in the changing room, so you concentrate on your phone and hit the summon button.

As soon as the icon is tapped, a torrent of white number strings flood the very air. In more ways than one, it's confusing. Especially as the numbers take shape into a body two and half times your size. As it becomes more physical, the color of brown fur and horns is clear. This is the creature that you're supposed to contract. In a real form. It's smell is proof of it.

"You stupid. You try to tell me what to do?" The ox monster speaks and you are still registering the surprise of it becoming real to properly react. It's nostrils take a whiff of the air. "You summon with talk box. Still not smell like human. But is?" Your phone did this. There's no question. It's just trying to figure out what to do from here. "Wait. What the fuck are you?"

"Me bull demon. Strong. You summon but, not strong as me. Me don't listen to you." Special contract. Keito brought that up. Having a giant pet ox isn't really on the top of your wish list, however. This all seems like a dream. "Well? You have deal? Or me just do whatever me want?"

Whatever the case, it clearly wants an answer. On the one hand, if it's not going to bother with you, it doesn't seem like your problem. On the other, letting some crazy ass ox monster run around the school, seems like a whole of questions from people that you would never be able to answer."Alright, so here's the deal. Listen to me and don't be shitty. Then...wait. What the fuck does a cow monster even want?"

"Me want fighting. And mate. Me conquerer." The increasingly rigid member of his is proof of one of those things. "Oh...fuck no." The entire day has been completely insane, but letting a giant ox demon rail you is pushing it. "Me need breed! You don't need to. Me use other persons for breeding. But user must get me them." You can only stare at him skeptically. "Who the hell is going to want to fuck a giant cow that smells like ass?"

"You problem. Not me problem. You find or do yourself." The idea of this thing giving demands to you is shitty, but you aren't convinced you could take it in a fight. It wouldn't be like the couple of scraps with humans in the past. Even if you apparently have powers, you don't have any idea how to use them.