(My NSWF warning won't work for some reason but yeah, this first is definitely NSWF)

1)

Katsuki lost a bet and you made him wear one of the revealing ass cheerleading costume. So he decided to mess with you. He took off his underwear and sat like that, but kept the skirt down enough to hide everything.

2)

There was a new cheer team captain for the sports team you played for. And you were expecting a cute, dainty, small girl like they team was full of. But it was a very very very attractive and muscular man.