A Bet's A Bet - A Deal's A Deal

Bill Cipher, a flirty annoying bastard who happens to be popular in school.

Dipper Pines, a small cinnamon roll who is oblivious to be flirted at. He lost a bet and things change.

Mabel Pines, Dipper's supportive twin sister, who have a girlfriend of her own. She made a bet with Dipper, and is helping him to enjoy the time of his life.