It's a yaoi manga and it starts with the uke forgetting that his birthday is on Wednesday and when the uke told the seme, he was upset because he already made plans that day. The uke is a working adult and has black hair and glasses while the seme is a college student and has light colored hair. They only meet on weekends because of uke's job and the seme's studies. The seme has a friend who is secretly in love with him. The first time he appeared in the story was when he and the seme were in university and he asked the seme if he wanted to be his partner in the project. The friend found out the seme was already seeing someone and when he saw that his partner was a man, he thought that he had a chance but his other friend said they were already too lovey dovey. (this is what i remember lol)