The collision

"I'm in love." The green eyed boy sings,

"The fuck am I suppose to do?" Louis deadpans ignoring the painfully unfamiliar lurch in his stomach at the words spat out By his enemy.

"Oh I don't know but let's start with a complimentary fuck."

"I'm not in the mood." Harry pulls a face at that, "You're always in the mood."

Or

An AU in which Harry Styles and Louis Tomlinson are enemies....enemies with benefits but no one knows what happens behind the doors between this enemies.