His father is a nephew of the king and his mother is a daughter of the king
Doesn't that make them cousins?
Also, they say "obvious sexual component", but then say the bites on the cheeks are "obviously sexual". So is there evidence of rape/sex, or are they just assuming so from the cheek bites? Though from the whole situation it sounds like these 2 were secret lovers (that is, if it began as consensual).