Second time's the charm.

"Is that so? I'd hate to give the impression that I play favorites," you grin, edging your jeans past your ankles and kicking them aside. Even as you do so you feel the blood re-enter your groin, rejuvenating it for the humping to come. Smiling back at you Karen pushes down the waistbands of her tight denim pants and underwear, leaving a trail of her arousal down her inner thigh.

"I've always wanted to try doing the cowgirl on the sofa, but Mark gets so tired he reacts like a wet fish even when I jump him," murmurs Karen. Your dick stands at full attention as Karen joins you on the couch, straddling you with her schoolgirl's figure with her hands on your shoulders and aiming right for your weapon. In a single stroke she goes down on you, sheathing your length inside her box. You throw your head back at the tightness of her canal.

"Ooooh, yes!" groans Karen, wasting no time as she goes at you like a piston. The couch's creaking harmonizes with the sounds of her skin smacking against yours, and Karen's beautiful boobs dance enticingly in front of your face as she bounces. Instinctively, you roughly grab Karen's twin moons, slippery and smooth from her sweat and your semen. The feel of her breasts is like holding two pillows filled with soft marshmallows, and after a brief moment of juggling and jiggling you latch your mouth onto her right nipple, nibbling and teasing at her areola. An excited squeal is heard as you do this and you feel Karen tighten on your tool.

"I love what you're doing there," she gasps as you move onto her left, sampling the delights of her other nipple. "Please don't stop!"

With Karen doing most of the work you're happy to oblige. It feels like banging one of those hot cheerleaders you lusted after in high school - except that Karen has far more superior tits. Still massaging her globes, you raise your head and meet Karen's lips with yours, taking in her tongue as she frantically cleans out your mouth. The combination of lubrication, motion and passionate lovemaking triggers a familiar twitching in your groin. "I won't last much longer," you manage to grunt, feeling Karen quite literally fucking the breath out of you.

"Do it in me!" she pants. "I want to feel it inside!"

In the position you're in, you don't really have the room for an alternative, but you're not complaining either way. You feel a massive heave as you rock your pelvis against Karen's, feeling yourself slide into her deepest regions, and you feel another torrent of seed splatter inside Karen's love box. The sensations of you filling her up sets Karen off, and she grips your shoulders hard as she releases a spray of her own fluids, wringing your cock for all it's worth. Her panicky gasps turn into satisfied moans as she slows to a halt, and the both of you lean against the couch's comforting material while you get your energy back.

"Looks like I know who to ask out next time I'm feeling lonely and bored," Karen whispers in your ear.

"I'm looking forward to it," you sigh, managing a knowing grin. It takes the both of you ten minutes before you regain enough strength to peel yourselves off the sofa. Karen helping you with your clothes, promising to call on you in the near future and that she'll have to get the living room clean before Mark returns. Soon enough you find yourself outside Apartment 3D, feeling great satisfaction with another territory conquered.