It was in the dorms where the clads was playing a game. Concept of the game : Kirishima propose 2 options and the class have to awnser but...

Kirishima: Now... 1 Millions dollars or...Kiss Bakugo on the lips?

Everybody: Show a paper with written "1 million dollars" on it

Deku: ●●● Show a paper with written "Kiss Kacchan on the lips"