Don't bother with this and just go read the Duskwalker Brides series by Opal Reyne. That'll definitely scratch your skull headed monster romance erotica itch.

The premise is full of all sorts of fucked up misogyny, but the story becomes fairly thrilling as the story moves forward. Chise is a really problematic character, but I give the writers credit for giving her considerable depth. The animation is really beautiful and I loved the creatures we got to interact with.