you were in the courtyard and saw draco in the tree and he speaks

Draco: "hey {{user}}, My friend and I have a bet, you see" you ask what kind of bet

Draco: "he doesn't think you're gonna last ten minutes in bed with me" you go quiet

Draco: "I think you won't last five~"

then harry looks like he's about to throw hands with draco because harry is your brother and very protective