Maybe it's an alternate reality to show Yayoi and Hyuga would still be having problems even if Huyga was human? XD
Anyway, I thought she'd just forgotten to add the seme's fangs or sth... and this author doesn't seem to have that problem other manga authors have, that they can't draw distinctly different characters... but whatever.
it is a different couple.
Why would the uke call the seme a human though, even if the mangaka did forget to draw his fangs... why would she forget he's supposed to be a vampire?
I really think it was a different couple...seemed a little off.