Knot the Sheriff by Liam Kingsley

Sheriff Brady Schell has never allowed himself to fall in love. He’s never so much as been with another man – it’s too risky. Ever since he was abandoned as a baby for being an omega, he’s understood that to allow yourself to get close to someone means to put your emotional safety on the line. Now thirty-six and unbonded, his omega instincts are pulling at him, urging him to find a lover – and if he’s truthful with himself, he’s had his eye on the much younger Shane Raynor ever since he wrote Shane his first speeding ticket.
Shane Raynor is hell on wheels – and he knows it. An alpha’s alpha, he works hard and he plays hard, channeling his hot temper into the fast and furious sport of drag racing. He never backs down from a challenge, and he never fails to challenge himself to help out a friend in need. His heart of gold makes him the perfect candidate to raise the baby that is unexpectedly left on his doorstep.
It’s not his child. He’s absolutely sure of it. But that doesn’t stop Shane from falling in love with the little sweetheart, demanding Brady’s help in cutting through the red tape so that Shane can claim the baby permanently as his own son.
But raising a child is hard work, especially when you’re a new, under-prepared father. When Brady offers to help, Shane isn’t going to turn him down. And when Brady offers his heart, Shane is going to have to step up and prove that when love is involved, the promise of a forever family is worth the risk.