One we don't know how long it's been nor how aging works in novel so uncomfortable cause the bear raised pup but as far as I can tell both go by the first name so caregiver/adopted ward
In aspect of ra** then it's technically bear who's been on all accounts raped not pup regardless of age or knowledge of what their doing (even if you state he's stronger than pup he could have stopped it; the novel acknowledges pup was doing it during hibernation)
The characters are following the laws of their animal counterpart (bear hibernating and that being an commonly accepted thing) so maybe calculate ages by animal years and appearance