He's like some kind of super anti-father, who wants his 'daughter-creation' to get fucked by everyone and everything with a pulse. Except her ass of course, 'cause that's speshul.
Everyone knows the backdoor is the most
special of places! That place that always seems to get the most honourable of treatments because buttstuff. Since it's Cait, it must be
extra special so you, the non-backer, can't have any! Oh, she's so special that not even literally meeting the
very god she worships is enough for you to get that sort of access, let alone knock her up.
That's for the peons in the temple you spent your cold hard cash on building just to win her favor. What's this? Even wanting to knock those people up costs a fortune? Well, time to get grinding and work on that Gweyr quest and--no, wait, can't do her too.
Jokes aside, it's hilarious that her anal virginity is what she treasures most when she has zero qualms riding the entire shaft of a demented, and possibly corrupted, horse. Will fuck anything that moves as long as it isn't her butt. Yours, though? That's free real estate.