Vampiric feeding is often used as an allegory for sex in this series. As such, vampires enslaving or attacking humans can be a stand-in for sexual manipulation, abuse, or violence. S1E8: an adult male vampire is said to have killed and devoured four young girls, and he uses very sexual language when describing the act of feeding. In the original Japanese with subtitles, he tells one girl, "Don't be scared, I'll be gentle." S1E9: from this episode onward through season 1, an adult female vampire is shown to have a very inappropriate, almost erotic relationship with some teenage characters. Her relationship with one, spanning years, feels very like an allegory for an adult grooming a child, and may make some viewers uncomfortable. S2E7: an adult man in a teenage boy's body makes a sexual pass at a teenage girl while they are alone. When she rebuffs him, he violently grabs her and slams her into a wall. Another character walks in and stops him before anything further happens. A boy and girl who have had a romantically-charged relationship finally kiss, before it is revealed to the girl that they are actually long-lost relatives. The boy, who had initiated much of this romantic contact - and the kiss itself - has been aware that they are related the entire time. S2E8: a character states that incest between siblings is normal in his culture. It is later mentioned that his own parents were brother and sister, and that they had intended for him to marry his younger sister when they grew up. She has been groomed for this role her entire life without realizing it. S2E12: an adult man grabs a teenage girl from behind and makes suggestive comments about her, and licks her neck. A vampire makes taunting comments about having drank the blood of an unwilling woman in a description that feels like an allegory for sexual assault.