Eh? Let me clear one thing:
Yaoi: mxm story/work which involve mature content
Shounen-ai: mxm, which doesn't have any explicit content.
Yaoi and shounen-ai, both are Japanese terms. BL term has vast usage/implications, it may contain explicit or non-explicit, Manhua, manhwa, manga, or dramas, etc, This term is used to refer to mxm work in general.
And I find some people here are really sensitive. It's just a work of fiction, let the author explore and transcends the level some of you guys find uncomfortable and toxic or whatever. I think you guys haven't read novels like flesh cartel, schadenfreude by 19, etc., that you're overreacting and being extra sensitive.
It's good to stop judging readers and authors who read and write/create fictions which are uncomfortable for you. Everyone has their own preferences and tastes.