Graphic novel recommendation: 45 year old mom likes erotic fiction hot/steamy/mysterious. Pop art style preferably, no anime or “comic book” style. Is there anything out there like this?

I'm dating a 45 year old mom and she's got a secret kinky side that we've only just started exploring. She is pretty classical in her tastes, and doesn't like fantasy, violence, gore, horror. I was originally thinking Frank Miller, but I'm not sure if that's right or not.

I know it's a really specific ask. As far as I know, this is just the usual "50 shades of grey" sort of tame erotic fiction. I just thought it would be fun to find her a graphic novel that's an easy, casual "thumb through" sort of thing for when I'm not around and she's feeling spicy.