Sniper's Surrender: Saint's Outlaws MC: Boston Chapter, #4

He surrendered her once to keep her safe. Now she's back, and this time, he'll destroy anything that tries to take her from him.

Tropes:

Second Chance Romance

Best Friend's Little Sister

Secret Exes

Forced Proximity

Jealous / Possessive MMC

He Broke Her Heart First

Only Soft for Her