At the flat

You made it . Letting you heavy bag go with a thud . The couch call your name . Sitting down and sighing thats when you here the noise. A distinct slapping sound with groaning and moans.

There is not a prize for guessing. Your flat mate Steven is fucking a girl. Feeling slightly curious you move silently to the door and peer through the open crack. Its the same purple haired girl from the shower.
"Mmmmhhhhmm, mmmmooohh"
Her moans make you wet again. You shake your head. Then get a funny idea. Let's mess with Steven shall we?