It's about a shy dude who's in love with an office worker. And they start dating but the shy dude thinks they're just having sex(without a relationship) cause they met up a lot at hotels and stuff until the other guy is like 'no, we were dating all along.' Also, I think the shy dude could look at the other guy's house from his house?
It's a collection of one shots and in the first story two people use the smoking room just so they can see each other. One of them even got into the habit of smoking just so they could keep seeing the other person.
Smoker (by person that wrote 10 Dance)?
ahhh no it wasn't that one but I found it now by looking through thr smoking tag thank you!!
what was it it sounds really good?
http://www.mangago.me/read-manga/datte_oishii_no_ga_warui/
It's the first chapter of this one!