His to Protect (Heart of Thornes #3)
Leo Rivers

Even if it means making the most dangerous decision of my life.
To keep my little sister from going into the system, I'm desperate for money. I take the I sign up as a gay sugar baby, trying to cash in my innocence.
It's not like it's doing me any good, anyway. 'Stressed-out nerdy virgin' isn't exactly anyone's hottest fantasy.
But my first date takes an unexpected turn when a mafia enforcer kicks in the door and kills my client in front of me.
Dante is a dangerous hitman, a killer. He should kill me for being a witness.
But when he sees my desperate situation, something unexpected happens.
Dante is older, confident, powerful -- everything I'm not.
And that innocence? He wants to take it himself. His to Own is a steamy gay first-time age-gap opposites-attract mafia romance novella, with a HEA and no cheating. It's part of the Heart of Thornes series, but can be read as a standalone.