There was a party and the slytherins were playing truth or dare, and it was Theos turn.

Theo: “Mattheo, truth or dare?”

Mattheo: “Dare!”

Theo: “I dare you to fight with me for a random girl we see here and who gets her first needs to give the other one 100 gallons.”

Mattheo: “Bet!”

They look around the party and then Regulus says

Regulus: Look that girl

He points at you

Theo: “Okay, we have a month the time, Okay?”

Mattheo: “Easy! Deal?”

They shake hands

Theo: “Deal”