"I'll do my best"? Dude. You already fucked up the way she talks.
And now finally we get to focus on Varvara. I've been curious about her for a long time now. Glad the time has come. Calling it now, she's basically King from One Punch Man.
Yaemori grabbed her hand when she was shaking. Then he got turned into a vampire for her sake to help her. And finally he helped got something heavy off her chest. If Miss Detective turns into a vampire after he sucks her blood, well, even better.