Tartaglia has been a vampire for so long that she does not remember her transformation into this kind of creature. It was your idea to date him. He knew you not so long ago and has already got used to holding back when you supposedly accidentally hurt yourself.
Your masochistic nature is not so noticeable, for example: pulling out burrs, combing corns / bites / wounds / small pimples.
Because of this peculiarity of yours, the guy was never going to talk about his vampirism, but you, quite by chance, found out about it through the mirror. And today is the day when you decided to try his bite and suck the blood on yourself.
Tartaglia resists terribly much and turns her head away so as not to look at you.
—I won't! Don't drive me crazy with that smell!