i think its a oneshot in a series. the one im looking for is about a boy lives next to a guy who's either a model or an actor. The boy has a serious crush on the guy but thinks its better to watch from afar. One day he saves the guy when he was attacked in the street an the guy gets extremely attached to him. Something happens an the boy tries to move away without telling the guy but gets caught. He drags him into the boys apartment an finds posters of himself everywhere.

Sounds like chapter 3 from Yuuwaku Sentiment.