Genesis by Jane Reventlov

https://www.amazon.com/dp/B01LYLV1FB A story of supernatural romance between monsters. Stuart, recently released from a psychiatric hospital, is fighting his own personal demons when he meets Genny, a Frankenstein's monster on the run from her creator. With the help of the weird goth kid at school, Stuart and Genny struggle for a happiness neither of them really feels like they deserve.