Tony-

Of a bartender at a club you go to together. He gets very possessive of you

Steve -

Of a waiter so he requests a new one

Clint -

Tony flirts with you but Clint just flips him off

Bruce -

Your ex rings you up and Bruce answers

Thor  -

He glared at the other guy who was eyeing you up until the guy went away

Loki -

He became extra clingy with you and wouldn't let you out of his sight or arms