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A men's bonding seems to be common among Vampires.
It appears that it is also common for Vampires to find a "partner," someone they spend the rest of their lives with.
Something like their "pair" it often doesn't seem to have any romantic relation to such a thing, as they're more like brothers or something?
Nonetheless, it sounds homo to me.
I remember reading this one manhwa named Noblesse… there was no Yaoi on it, but the bait was pretty strong…
Well, this thing had the same concept… the protagonist was in a bond of eternity with his servant, a human… which allowed the guy to live a long life with his master.
He would always go, "Yes~ Mastah~" and it was so homoerotic it always made me laugh.
Are the Vampires of the world the same?!
Then aside from generally being cold-blooded murderers and sadists, they're also into THAT sort of stuff.
Indeed they're aggressively French, I guess…
Check "The Protagnist's Sister Is Actually the Strongest"!