and thus are unable to give meaningful consent
Not to mention "have been trained from birth to basically be concubines for Next Master of Tigers"

Meph says that the other tigers are "looking for a place that smells like home" while he (already) "has a home." In this series, "home" almost invariably means a perfect lover/soul mate.
...and so it follows that he has a significant other! Oh my gosh, how did I not see that?!