The bar reeked of sweat and cheap whiskey, but the second she walked in, every alpha in the place knew she was in heat. Her scent hit like a fist. Sweet, thick, dripping with need. She tried to play it cool, ordering a drink, but her thighs rubbed together with every step and her nipples poked hard against her thin tank top. I watched from the corner booth, cock already swelling in my jeans. She was an omega, and she was burning.
I didn't ask. I just stood, crossed the room, and grabbed her wrist. "You need a knot," I said, low and rough. Her pupils blew wide. She didn't pull away.
We barely made it to my truck. I shoved her into the back seat, ripped her shorts down, and buried my face between her legs. She was soaked, slick running down her thighs. I licked her open, tongue fucking into that hot cunt while she grabbed my hair and moaned like a whore. "Fuck, alpha, please." Her voice cracked. I sucked her clit hard and she came, gushing over my chin.
I flipped her onto her stomach, yanked my cock out, and slammed inside in one thrust. She was tight, velvet heat gripping me like a fist. I fucked her rough, hips snapping, balls slapping against her ass. Each stroke made wet, filthy sounds. She pushed back, begging for more. "Knot me. I need it."
My knot started to swell at the base. I drove deeper, grinding it against her entrance until it popped inside. She screamed, body locking around me. The knot ballooned fast, stretching her wide, locking us together. She shook, coming again, cunt pulsing and milking the thick bulge. I couldn't pull out even if I wanted to. We were tied.
I kept thrusting in short, brutal strokes, the knot rubbing her G-spot with every move. Her slick mixed with my precome, leaking out around the seal. She clawed the seat, sobbing with pleasure. "So full. Fuck, it's so big." I reached under her, rubbed her clit in fast circles, and she squirted, soaking my hand and the leather.
The knot throbbed, growing tighter. My balls drew up. I bit the back of her neck, marking her, and came hard. Thick ropes of come pumped straight into her womb. She moaned like she was dying, another orgasm ripping through her as my seed filled her up. The knot kept us sealed, every spurt trapped inside. Her belly felt hotter, rounder against the seat.
We stayed locked for long minutes, breathing hard, my cock still twitching. I rolled us onto our sides, spooning her, knot still buried deep. My hand slid over her stomach, feeling the slight swell from my load. She whimpered and pushed back, grinding on the knot. It sparked fresh pleasure, making me leak more.
"Again," she whispered. I reached down and worked her clit slow and steady while the knot pulsed. She came twice more before it started to go down.

When I finally pulled out, come flooded out of her stretched hole, thick and white. She reached back, scooped some up, and licked her fingers clean.
We didn't leave the truck for hours. Every time the knot deflated enough, I fucked her again, knotting her over and over until she was limp, marked, and leaking. By dawn her heat had broken, but the claim was done. She was mine now, knotted and bred, and she smiled when I told her we were going home.