Cassandra is looking for this one! It makes me think of one of my most favorite series “The Succubus Diaries” from back in my strictly paranormal days that had me crushing HARD on the good angel but even harder on the dark angel (“Zane”). OMG I was in LOVE with him!!! What a love triangle!!!
But I don’t recall her being a social worker, so I don’t think my guess is the one…
Short and sweet.
Only thing I can remember about the book is that female social worker is attacked after leaving a home visit.