Character X owes Character Y something. Character Y thinks it's time to pay up.
Character X shows up to a blind date... Who turns out to be Character Y.
Character X catches Character Y staring at them from across the room.
Both characters are trapped together in a small, enclosed space.
Character X is trying desperately to keep Character Y from finding something embarrassing.
One or both characters are extra-compulsive because of magic, exhaustion, or caffeine.
Character X hangs out with Character Y to avoid thinking about something else.
Character X accidentally walks in on Character Y, who thought they were alone.
Character X is having trouble hearing or seeing, Character Y helps (or hinders).
Both characters play 'Never Have I Ever', 'Would You Rather', 'Truth or Dare', or some other party game.
Character X finds or adopts an animal, shows it to Character Y.
Character X sleepwalks, and Character Y gets to witness it.
Character X is injured and is trying to hide it from Character Y.
Character X takes Character Y to go can smash stuff or get into a bar fight.
Both characters must work together to escape a fire, flood, or another disaster.
Character X has a secret, and they need to keep Character Y from telling
Character X catches Character Y taking pictures or doodling sketches of them.
Character X has to put on/take off a complicated outfit, Character Y is helping them.
Character X arranges a group activity, Character Y is the only one who shows up.
Character X admits something to Character Y that they've always wanted to try.
Character X accidentally gives Character Y a black eye, broken nose, or split lip.
Character X needs to pretend they're on a date with Character Y, planned or unplanned.
Character X accidentally walks in on Character Y, who thought they were alone.