Now that Flan has had a faceful of... of Yuugi, I predict that this story arc will end with Sakuya hugging Flan, and then Flan comments about the difference in the experience.
Never mind that vampires don't actually breathe...or is that just strigoii? I don't quite know what's meant by moroii being "living vampires" (well, besides the likelihood that moroii can sire/bear dhampirs, while strigoii can't).