Your vamp/affagato ship has intrigued me,,,
I knew I'd allure someone with my crackship, and I'm using this as an excuse to talk about it!
Note: This is so headcannon heavy, do not expect much canon compliance from me
Anyway, this is entirely separate from my Vamp/Sparkling/Herb ship, they don't coexist well, but it still keeps the majority of my headcanons about Vamp
The biggest thing being; Vamp may have been born what he is, but that doesn't mean he enjoys it. In fact, he kind of hates it. Him and his sister are both technically only half vampire, but while Alchemist scraped by with only a couple traits (enhanced senses, pointed ears and fangs, a small bat form), Vampire ended up with all of them. He wants to go into the sun, he doesn't want to hurt people to sustain himself. (Both of these points are biiig driving points in both my Vamp fics)
Despite this, his much larger bat form and the vampiric lineage he comes from makes him a beast to reckon with. In particular, it means him and his sister are almost considered 'favorites' of the witches.
Is he as powerful as he could be? Absolutely not, this man won't take care of himself well enough to not be half-starved at any given moment.
That fact isn't something that really matters to a certain power hungry, conniving ex-ruler of the Cacao kingdom.
Hearing through the grapevine (hah) about Vampire and Alchemist's rumored power, he decides to go seek them out, and find any way to get them on his side.
Cue Affogato quickly discovering how susceptible Vampire can be to flattery, especially when it comes with a level of acceptance towards him. And when he can't hold off a need for blood, Affogato just happens to mention someone oh so dangerous, who would be much better off the streets. Real at first, but then the next time comes around, and what's a little exaggeration? A little white lie.
In general the ship is a really big exploration of Affogato and Vampire for me and my partner, digging into both of them.
With Affogato, he slowly begins to realize he's gotten close to Vampire, closer then he ever should've gotten when he's just using him to get his power back.
And with Vamp, at some point he realizes what Affogato's turning him into. But then again, who else will accept him at this point?
It doesn't end happily, but it is interesting no matter what. Inventing my own toxic yaoi as if this game didn't have enough already.