In one of my stories, vampires are asexual. (They don't reproduce sexually, so why would they have sexual desire?) They also age slowly instead of not at all - 1 year in every 20 until adulthood, then 1 in every hundred afterwards, though it takes awhile for a newbie vampire's aging to slow down to this rate. Oh, and they're all fascinated by medicine and biology, which typically starts off by noticing different tastes to sick people's blood. The protagonist is the first vampire. He was found at the apparent age of 18 months or so, and was adopted by a family. They've handed him down over the generations, and now he's 280 and looks to be in his teens. As far as he knows, he's the only one of his kind, and all he knows about vampires is what he and his family have figured out over the years. Importantly, he currently has no clue that he could turn someone into a vampire. His family is about to adopt a 'double orphan' (an orphan whose adoptive family died after taking him in) even though everyone else thinks this kid is bad luck. The vampire's going to bond with this kid over the experience of being orphaned multiple times. And for the first time in his life, he'll feel the parental drive - the closest thing vampires get to a sex drive, but it's aimed at people they feel parental towards and want to turn. He'll be pretty confused by these feelings, and - having never felt sexual desire - he might think he's sexually attracted to this kid, and get freaked out and horrified at the thought. But I don't want the readers thinking this feeling is sexual. How do I make it obvious to anyone who's had sexual feelings that this is not sexual? So far, my one idea is that he has no reaction in his genitalia, but instead feels an itching in his cheeks (vampires store a virus for turning people in pouches in their cheeks). Would that make it clear enough?