He's off-limits. My best friend's older brother. The one man I was never supposed to want. When nineteen-year-old Eli shows up at the Maddox house heartbroken and lost, the last person he expects to find comfort in is Zane-the gruff, tattooed mechanic who's spent years pretending not to notice him. But in the quiet of the night, secrets slip. A knock on the door. A hand on his jaw. A warning whispered in the dark: "Tell me to stop...and I'll never touch you again." Eli doesn't tell him to stop. Now every glance burns. Every touch tempts. And every stolen moment pulls them deeper into a dangerous obsession neither of them can resist. Zane is older. Rougher. Cole's brother. The one man Eli should stay away from. But desire doesn't play by rules-and once Zane claims him, there's no going back. Torn between loyalty and longing, they're playing with fire in a house built on secrets. But when love feels like both salvation and sin, how do you walk away? His Brother's Keeper is a forbidden age-gap MM romance packed with heat, heartbreak, and the kind of love that risks everything.