Yaoi name pleaaase

Help! The yaoi manga had an old artstyle. It was about a music teacher and a student. The student had a crush on the teacher, and he confessed but since he was his teacher and the student was only 17/18 (if i remember correct) he reject him, but after the student more few tries and all the teacher finally accepts him, I remember that they where on the piano playing when the teacher accepts him, and they kiss, BUT there was a female teacher that was hitting on the music teacher and was all over him and she was searching for him and when they're kissing she finds out about them and she tells everyone, the director then calls the police and the teacher is fired and is prohibited from seeing or approaching the student ever again. The student then sends a letter to him and he reads it on a beach, telling him that he's sorry and that he truly loves him, and when he turns 21 (legal age) he will come back for him! And then in the end there's a time skip where the teacher is on the beach again rereading the letter and then he turns around and see the student and the end...