Cheating with My Spouse's Sibling

The door clicked shut, locking you in with your spouse's sibling, Alex. There was no hesitation; Alex pushed you onto the bed, hands immediately diving under your clothes to squeeze your breasts and grind against your crotch. You knew this was wrong, but as Alex’s tongue flicked against your ear, your legs flew open. Alex didn't waste time with foreplay, stripping naked to reveal a hard, pulsing cock that throbbed against your thigh.

Alex grabbed your hips, pulling you to the edge of the mattress. 'Your partner is just a room away,' Alex whispered, before shoving a thick finger deep into your soaking wet pussy. You gasped, your back arching as Alex worked two fingers in and out, stretching you out for what was coming. The sound of wet, slapping friction filled the quiet room as Alex leaned down to suck your clit hard, making you moan loudly despite your guilt.

Without warning, Alex gripped your cock/pussy and lunged forward, burying their length deep inside you in one heavy thrust. The sensation was overwhelming. Alex began to fuck you with a primal, rhythmic intensity, their hips slamming against yours with loud, meaty thuds. You wrapped your legs around Alex's waist, pulling them deeper, begging for more even as you heard footsteps in the hallway. The risk of being caught only made your walls clench tighter around Alex's shaft.

Alex picked up the pace, thrusting harder and faster, their sweat dripping onto your skin. 'You like this better than them, don't you?' Alex grunted, slamming into your cervix. You couldn't even answer, too busy choking on moans as the friction built to a fever pitch. Alex's hand reached down to massage your clit while their cock hammered inside you, driving you toward a shattering climax.

As you both neared the edge, Alex's thrusts became frantic and shallow. With a final, violent shove, Alex let out a low growl, pumping thick, hot cum deep into your pussy. At the same moment, your own orgasm ripped through you, your muscles convulsing around Alex's cock. You lay there panting, covered in sweat and cum, listening to your partner call your name from the other room.