Karen's words and her open lust makes you back your doubts.

You still have second thoughts about fucking another girl, but seeing Karen’s horniness makes you swallow your doubts. Satisfying her desires was more important to you and you didn’t want to disappoint her after letting her build up her expectations so high.

You rest Sarah’s legs on your chest and press the tip of your cock on her hot pussy. She moans in desire and pumps up weakly, demanding more. Karen gently runs the tip of her finger from the base of your shaft till where it joins Sarah, and then continues on to Sarah’s clit, massaging it gently in little circles.

You slide in slowly, wanting to fully enjoy every inch of her warm pussy. You barely feel any resistance but her pussy starts gripping you, massaging your cock and enticing it further in. You marvel at how different it feels from Karen’s: less tight but amazingly welcoming. There was no doubt about how experienced her pussy was - she gripped and moved in ways that your cock had never felt before. You wondered if you could last more than a few thrusts.

Meanwhile, Sarah’s moans become louder as she moves against you enthusiastically. Karen keeps her eyes fixed on your thrusting cock, her finger continuing her massage as she whispers encouragement at both of you: exhorting you to fuck harder and deeper, as she grinds hard against Sarah’s face. Suddenly Karen grabs your face and kisses you hard, and you feel her entire body thrum in a massive orgasm as she moans loudly against your lips. Her orgasm lasts a long time as her moans tone down to quieter whimpers. She shakily gets off Sarah and collapses almost immediately on the floor, giggling deliriously as her legs continue to quiver.

Sarah continues to moan: loud enough for your neighbors to hear. You are beyond caring by now: the only thing you care about is your cock thrusting into her pussy. Not even Karen had made you feel this good as you thrust harder, impatient to cum inside her. You feel Sarah shudder loudly and her entire pussy throbs all over your cock. You almost collapse from the pleasure as she wraps her legs around you, bucking and grinding as she cums.

Karen manages to stand up and then whispers into your ear, “This is the best sex I’ve ever had with you, and you haven’t even fucked me yet." She moves her hand over your ass as she speaks, then gives your asshole a gentle prod. Suddenly your mind goes blank and you're gushing all over Sarah, as you get hit by one of the best orgasms of your life. You collapse on Sarah who eagerly kisses your mouth as you fill her up.