Looking for a yaoi school-life manga title...

Recalling two inter-linked stories. The first (main) story is about a high-school sensei (school-doctor/teacher) and a high-school student couple. The second story which follows is at the same high-school and is a student and student relationship with a tough looking high-school delinquent seme with medium length light hair who wears a loose-open-school-uniform-shirt over a t-shirt (he is friends with the boy from the first story) and he is taller than the short timid high-school uke with dark hair who wears his school-uniform neat-and-proper. They kept meeting up in the school-rooftop and they soon began to sleep together. There is a time-skip/time-jump that happens during the second storyline where this couple are arriving at their college entry and both the seme and uke appear to be older-young-men now. Only the uke is much taller and muscular than the slender seme. The muscular/tall uke is still timid even though he is getting noticed by college-girls like he is eye-candy to these girls which the uke does not realize how good-looking he is from his growth-spurt. One day during sex (in their dorm-room/bedroom/apartment), the muscular/tall uke confesses that he hates still being a virgin, more so now that he is muscular/taller than the seme, and he wants to have sex like real men do. The seme starts planning to get a college-girl to sleep with his boyfriend so the uke could lose his virginity. The seme is going to talk to his college-female-friend who likes uke (his lover), but she does not know that they are boyfriends. The seme loses his nerve in asking her because he doesn't have confidence that he can keep his boyfriend after the uke sleeps with a college-girl. In the end, the seme decides to bottom for the uke (that way nobody but him touches his lover while he makes his boyfriend a man). If anybody knows this manga title please let me know. TY in advance <3.