So I entreated the amazing Wizard of Oz Turnsky to add another look into Ash & Mercy's weirdness.
Mercy should have better manners than this, really... She's old enough to know better... Well, at least it gets a rise out of Ash.
You can find Turnsky's work here:
Ash...He's an asexual throwback to Victorian sensibilities.
Mercy...She's a nymphomaniac succubus who can't figure him out.
Somehow, the roommate thing is working...