The thing it has to do with his asexuality is that he lacks the natural positive context for sex that comes with being allosexual. Most rape babies grow up, start having sexual thoughts, and are forced to come to an acceptance of sex. Narcissus has zero positive experience with sex. There’s nothing to counter his association between sex and his mother’s rape. That’s explains why he’s rude to people who sexually harass him. I thought that context might be helpful, since the other person in this thread is saying that he’s evil for not loving anyone.