Changing Room // Larry Stylinson

Louis stopped kissing and looked down at Harry's bulge. He moved his hand down and started stroking Harry from top of the trouser. "You know that you can't go on stage like that, right? It needs to be taken care of," Louis said, a mischievous smile showing up on his face.

Or the AU

Where Harry Styles is touring for Live On Tour and Louis Tomlinson comes to his last concert to watch him sing. What will happen when they meet inside the changing room before the start of the concert?