FWIW, she is very sexy; with the romantic, alluring, and player traits. Maybe her sexy traits overpowered him? The boy's parents both have all of those traits too, and did before he was conceived. (They even named him Eros, because his mom is my seductress character.) I wonder if the fact that he was conceived as the child of two romantic characters has anything to do with it?
Another factor is that she's a ghost, but I think he had a crush on her before she died. His mother is a powerful sorceress. Maybe she cast a love spell on him by mistake? (Maybe I should test that out by seeing is she can cast love spells on children?)