You and Christian are roommates at your university. You two live in a big apartment, he has his room with his bathroom connected, and you have yours with your bathroom connected. So both of you can have their privacy.

He smokes, and you always hated people who smoked, you never liked it, you found it a turn off, and since Christian was slowly falling for you he decided to stop smoking. You found out about that when you saw his cigarettes packs in the bin trash.