*bares his neck in the most submissive manner possible*
Yes, half. [And now he looks visibly uncomfortable, but he might as well tell the truth. Yuuri already shared it publicly.] I have half demon blood.
[He's... a little surprised by the concession.] It is no trouble. It is I who should apologize for being so...effected. [He leaves the last bit of his statement unspoken: effected by your vampiric charms.]