deku was alone in his room, noone knows what is he doing, so Bakugo went to Deku's room to check on him and then he saw deku kissing a peluche with Bakugo's image on it, bakugo was totally shocked by that

Deku: notices that bakugo is looking at him AH! Kacchan I can explain, really!

Actually bakugo always thought that deku would be a yandere