muse ✨'s manga / #misses the emotional mark(1)

On a school trip, 17yo Rin is shocked to wake up next to homeroom teacher Takamura, who touches him, leaving Rin upset. Takamura, the son of a politician, later reveals that they had studied with the same piano teacher seven year ago, when he was 17, and that playing together with Rin had been the only time he'd been happy. The back story is nice. The rest of the story is explicit sex justified by a thin romance. I'd love this if I felt Rin loved Takamura, but this reads as coercion by a teacher. Rin is in his third year by this point. Since he's going to school shortly anyway, I wonder why Takamura didn't tip him off that they'd known each other and then struck up a friendship until Rin was no longer his student. "That's because teacher x student is hot!" It can be so, so hot and I like it in fiction, but this missed the emotional mark for me entirely. I didn't like Takamura at ALL. He's too manipulative. Side note: Rin's father is super hot.