Age Gap Yaoi

A teacher and a student, but the teacher previously dated the student's sister.
Trigger warnings: dubcon, statutory rape(?)

A high schooler lives with his teacher, (the teacher himself a former student of the high schooler's deceased father) and falls in love with him, but he's heartbroken when he finds out his teacher once had feelings for his dad.
Trigger warnings: statutory rape, sex work by a minor.

Akira can't handle his love for his new stepdad, so he runs away to his teacher Tojima's house and also has Tojima jerk him off.
Trigger warnings: noncon, statutory rape(?)

Gay teacher ends up living with his student who instantly finds out he's gay and asks his teacher to help him practice sex

A teacher gets found out by his student as an idol otaku, so the student makes the teacher his "dog" without telling the teacher that his favorite idol is actually the student's older brother.
Trigger warnings: blackmail, dubcon.

High school teacher Haruchika is happily living with his former student and current lover, Kiyomasa. When his current troubled student takes a liking to Kiyomasa, though, the boy feels Haruchika is taking advantage of Kiyomasa's kindness, and Haruchika worries he might be right.
No trigger warnings.

Yukimura is broke from taking care of his sick little brother, but when he tries to sell himself, he can't go through with it. He's saved by his former teacher, Kurosu, who offers to buy Yukimura both for sex and as a live in housekeeper. Yukimura accepts but keeps his guard up, but just as he's starting to imagine a future living together, yet another misunderstanding threatens to drive them apart. Dumb misunderstandings, tough and interesting uke.
Trigger warning: dubcon.

A teacher hires a male prostitute, but it turns out to be his former student.
Trigger warnings: sex work, noncon, S&M.

Yuzuki's a professor with a longtime unrequited love for his younger brother, Takayuki. University student Kazusa finds out and blackmails him into a relationship, but this actually spurs Takayuki to confess to his brother! But Yuzuki rejects his brother for his sake, causing Kazusa to question what he's been doing.
Trigger warnings: rape, blackmail, statutory rape, incest themes.

Saeki is out drinking when he mistakes a stranger for his boyfriend and they fool around. Turns out, the stranger was his student at university, Yamamato, and Yamamato is not letting go.
Trigger warnings: cheating, drunk intimacy, blackmail, dubcon, bondage.