=> Doukyuusei is a good one, (2 high school boys falling in love) it has a movie as well! Make sure to read Sotsugyosei after. There's a spin off with one of the characters, I haven't read that though so I have no idea if its good or not. (if you're not into teacher x student relationships, def pass the spin off, parent story is between 2 students.)
=> Given, manga, anime, and movie (very sad, depressing, but amazing music)
=> Secret XXX and Therapy Game (secret XXX is a parent story to Therapy Game, story is very wholesome, fun read).
Wish I could list more, but those are the good ones that come to mind. I read a lot of hot garbage.
Here is my list for BL with strong plot ! _ https://www.mangago.zone/home/mangalist/2621915/
And yes they have healthy relationship (the naughtier ones are in the naughty corner at the end of the list lol.)
Bl without abuse/SA between the main couple. No short porn stories and preferably a strong plot. Thank you :)