The one in which Stiles decides to tell Derek.
Stiles: I’m going to tell him.
Scott: Tell who? What?
Stiles: I’m going to tell Derek about my feelings.
Scott: Are you sure that you love him?
Stiles: Love him? Are you out of your mind? Of course not! I mean… I just don’t know what it is. It’s awesome when he is around and… My heart is beating like a hammer when we talk…
Scott: Dude, that is what people call love.
Stiles: Okay! Okay. Maybe I do love him.
Scott: Now you can tell him. Because now you now exactly how you feel.