Hmm, there was this manga i think it had 3 chapters or something like that. Two working adult friends living together. One was an artist (but probably not mangaka) and wanted the other one to model. When the other one was modelling (naked?! i don't remember) something clicked. Then there was some harsh realization of feelings, some running away in the rain and ultimately confession.
Also maybe one of them was a fashion/clothes designer or something?
I just remembered the manga, have recollection it was good, but i can't find it at all o.O