Luffy and you both like each other but you two don't know.

Luffy saw you talking to another guy at school inside your classroom. Luffy was glaring at the guy from behind. Since he was the one sitting behind you

Luffy was getting more jealous once he heard you laugh a bit.. He doesn't hear what you and the guy was talking about..

He then got up from his seat and did the unthinkable he hugged you from behind and put his head on your shoulder