Devilвђ™s Mark By Lark Taylor -

A fresh take on angels and demons that avoids purely "good vs. evil" religious tropes.

Cal places a magical mark on Oscar's forehead to claim and protect him, a unique world-building element that signifies their bond. Key Characters Devil’s Mark by Lark Taylor

Lucifer is demanding his sons return to Hell. A fresh take on angels and demons that

The story centers on , the eldest son of Lucifer and the former "Butcher of the Ninth Circle," who now runs a bookstore in the human world. Cal has never sought a long-term relationship, especially with a human, but his life changes when he meets Oscar , a brokenhearted English teacher. Key Characters Lucifer is demanding his sons return

Respectful portrayal of anxiety and recovery from abuse.

Headless bodies are being left in Cal's bookshop by an unknown demon, putting Oscar in danger.

Described as "explicit and plentiful" with high sexual tension. Devil's Mark (The Reckless Damned, #1) - Goodreads