I have seen that concept in a decent chunk of vampire stories outside of yuri as well. It actually makes sense as a story device.
What's funny about this is that while it's a common vampire trope I've literally yet to see it. The classic route is forcing the human into a situation where they are mortally wounded or otherwise have no choice; thus the gamble becomes acceptable. And so far I've only ever seen it go right - which of course makes sense, but also means there's no real tension or feeling of jeopardy to this sorta thing.
It'd imo be more interesting if the downsides were something less "it goes perfectly right, or it goes perfectly wrong". That'd give the author actual scope to make something bad happen without it being a complete "now everything's fucked" story.