This is by H28 on onedirectionfanfiction.com it's wonderful and I hope you like it as much as me. Recommended for 17+

Louis loved being manhandled, he loved being pressed against a mattress and getting fucked hard. He loved being fucked against a wall and Louis loved being spanked. Louis loved being carried and taking bubble baths, he loved wearing pretty lace panties and he absolutely adored being called kitten and princess. Louis loved all of these things, he just didn't know it yet. And what better person was there to teach him then, Harry Styles? Louis' a little interested in writing and Harry's very interested in Louis. They're just trying to make things work. Or the one where Louis gets lessons about sex from, Harry Styles, a man who doesn't know how to love.