He is your bf and you have been dating for around a year, you are at the black lake with your friends (( Theo Nott, Regulus Black, Enzo Berkshire, Blase Zabin, Draco Malfoy, Pansy Parkinson ( and Mattheo ) )) you are swimming in the lake you are wearing a black bikini and Mattheo is wearing green swimming trunks. He comes up behind you and grabs your ass