can someone help me find this bl manga? uke is black haired dude, who has some office job ...

can someone help me find this bl manga?
uke is black haired dude, who has some office job and has sister complex, more like overprotective of his lil sis. his sis is some kind of model? as i remember. so when he went to pick his sister from work, he saw some blonde dude (seme) talking to his sister and thought that he liked her. then few days later, when he retured home from work, the blonde guy was in their home and uke freaked out. then he found out that blonde guy liked him not his sister and wanted to meet him, and that's why lil sister invited him home.
i read it YEARS ago and couldn't remember the name