It's really hard to say if the author truly just didn't consider the age distinction was a issue and/or that Seregil was previous enough to have a sexual romantic relationship, if only it had been with out ulterior motives - or if she intended for the reader to assume that Seregil is continue to in deep denial about possessing been molested as a kid. Garranon also desires revenge but is sensible enough not to consider it straight away.