hmm, i guess it did come out of nowhere, and it's not my usual cup of tea for sure...but yeah. kinda hot?
I wouldn't entirely say it's out of nowhere, since we're getting more evolutions as part of her progression after turning into a vampire, which I think is fun to see, especially how those evolutions factor into sex. Plus I think it's nice to see uncommon fetishes like tail-sex, we have a lot of great vanilla sex in Yuri and sometimes spicing it up is fun.