Defrocked. House of Bolton Novella, #1

Faith Shattered. Vows Broken. After three years spent grieving secretly for his past lovers, a chance at something new appears in front of Killian McDonald. But will he grab a hold of what Nicoli Beltrame is offering him or ignore it in favour of renewing his commitment to his faith. Love isn't restricted to being a once-in-a-lifetime opportunity. Nicoli Beltrame knows this firsthand having fallen in love with several men already, and he isn't one to shy away from a chance of falling for another.
It doesn't matter that Killian was a gift to him from his deceased nephew or that it came three years after his nephew had been buried. But Killian is different to the other men who share Nicoli's bed-a priest with broken vows and shattered faith-while his world is full of danger that might cost Killian his life. Defrocked is a 36k MM+ age gap novella set in the House of Bolton universe. It involves a priest with shattered faith and broken vows falling in love with a mafia emissary who sees the priest's darker desires and willingly grants them.
Being MM+ there is also consensual sharing of partners.