are those your own distinctions, or did you get those definitions from somewhere else?
when I was newer to BL way back when, I thought it was shounen-ai vs. yaoi - both had romantic/intimate relationships between men, but only yaoi would have sex scenes. and that was because of how manga sites used their tags.
I couldn't tell you where exactly, but then I read somewhere that Japanese fans wouldn't make that distinction along those lines (shounen-ai being literally, [underage] boy love) and instead, BL/boy's love was the umbrella term that included everything that would be considered shounen-ai and yaoi to english speakers. they would just use "adult" or age ratings (r15/r18+) to indicate if it had sex in it. meanwhile yaoi was a doujin term whose English equivalent might be "pwp" because it was fan/derivative content of an existing work that was focused on sexual relationships between men and not much else. if you go on Japanese sites, officially published and fan works will both use BL, while yaoi is more so for fan works.
all this to say that I don't think the "love" in "boy's love" isn't so strict that master-peace wouldn't be considered BL, especially when that's used as a tag to indicate that it's got an intimate, non-platonic relationship between men in it, even if it's not necessarily romantic.
This is what showed up when I googled it.
I say this because there is no romance (so far). Only mostly politically-driven noncon sex.
If you look at the definitions, this can, indeed, be considered yaoi. But not BL.
- Yaoi: media focusing on romantic OR sexual relationships between male characters.
- BL: media focusing on romantic, emotional, and often intimate relationships between male characters.