I suppose 10 in roman numberals *is* X
Now that I've seen a lot of samples from this comic, it seems just like an excuse to have lots of girls bent over in various suggestive poses (and sometimes quite direct poses [cw: implied sexual assault in link image]).
This cover is no exception, and the cat is I guess there to balance out that the blonde girl is in doggystyle at the back. Also she's even more flexible than the cat given how her torso is like liquid.
I suppose ten in roman numerals *is* X. Maybe they should call this comic "The Thirtieth".
(Cover of The Tenth #3, Image Comics)