I had no idea my girlfriend Lisa was serious until the guy showed up at our apartment door. She had been teasing me for weeks about wanting to see me on my knees with a real cock in my mouth. "Just once," she kept saying, her voice low and filthy in my ear while she stroked me. "I want to watch you suck it, taste it, swallow every drop." When she finally brought home her coworker Mark, a tall, thick-built guy with a cocky grin, I knew it was happening.
Lisa didn't waste time. She pushed me toward the living room couch and told Mark to sit. "Strip," she ordered me, her eyes locked on mine. I peeled off my clothes while she did the same, her full tits bouncing free, nipples already hard. Mark stayed dressed at first, just leaning back, legs spread. "Go on," Lisa said, her hand sliding between her own legs. "Pull his cock out and suck it like you mean it."
My hands shook as I unzipped him. His dick was already half-hard, thick and veined, heavier than mine. I wrapped my fingers around it and gave a slow stroke. Lisa moaned from the chair across from us. "That's it. Open your mouth." I leaned in and licked the head, tasting salt and skin. Mark grunted and pushed his hips forward. I took the tip between my lips and sucked, sliding down an inch at a time until my mouth was stretched around him.
Lisa's fingers worked faster between her thighs. "Deeper. I want to see your throat bulge." I pushed lower, gagging when the head hit the back of my mouth. Spit ran down his shaft and over my fist. I bobbed my head, sucking hard, tongue flattening along the underside. Mark's hand landed on the back of my head, guiding me, fucking my face in steady thrusts. The wet sounds filled the roomslurping, choking, Lisa's soft gasps as she watched.
She stood up and moved behind me, pressing her bare body against my back. Her fingers reached around and stroked my own aching cock while I kept sucking. "Look at you," she whispered, biting my ear. "My boyfriend with another man's dick down his throat. You love it, don't you?" I moaned around Mark's cock in answer, the vibration making him twitch. She pushed two fingers into my mouth alongside his shaft, stretching my lips wider.
Mark pulled out long enough for Lisa to kiss me, tasting his pre-cum on my tongue. Then she shoved me back down. "Don't stop until he cums." I sucked harder, one hand pumping the base, the other cupping his heavy balls. Lisa knelt beside me, watching inches away, her breath hot on my cheek. "Swallow it all," she demanded. Mark's thighs tensed. He groaned and flooded my mouth, thick ropes of cum shooting over my tongue. I swallowed what I could, the rest spilling down my chin while Lisa licked the overflow from my skin.
She wasn't done. She pulled Mark's still-hard cock from my mouth and guided it to her own lips for a quick taste before pushing me onto the floor. "On your back. I want to ride your face while he fucks me." I lay there, cock throbbing untouched, as Lisa straddled my head. Her wet pussy settled over my mouth and I licked her clit while Mark moved behind her. He slid into her with one thrust. I could see every inch disappearing into her, hear the slap of skin, feel her juices dripping onto my tongue.
Lisa came first, grinding down on my face, her moans loud and raw. Mark followed soon after, pulling out to shoot across her ass and lower back. Some landed on my chest. She climbed off, turned around, and fed his cum to me from her fingers. "Good boy," she praised, stroking my cock until I exploded untouched, cum spurting across my stomach while she watched with a satisfied smile.
We didn't talk much after. Mark left with a nod. Lisa and I showered together, her hands gentle now, washing the mess from my skin. Later in bed she curled against me. "Next time," she murmured, already half-asleep, "I want you to fuck him while I watch." I didn't answer, but my cock twitched against her thigh. She felt it and laughed softly. The night had changed something between us, and we both knew it wasn't going to be the last time I sucked cock in front of my girlfriend.