I Think of You Often by Sienna Eggler

In I Think of You Often by Sienna Eggler, a vampire witch, a shifter witch and a regular witch establish a polyamorous relationship.

This is mostly paranormal romance, with a little bit of action plot, but I wasn't really into the latter.

There's major nb/nb/f (polyamory in a V). Three characters are on the autism spectrum.

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I've compiled a list of T4T books here.