You are, and it's time to do her doggy style

In response to her question, you got onto your knees and began rubbing and lubricating yourself with the hand that was coated in her juices. "Get back up here." you told her, feeling the firmness of your erection in your hand. "I'm ready, and I can't wait to watch that thick ass shake as I fuck you from behind."

"Holy shit David, you're a machine! I didn't actually think you'd be ready this fast, but, fuck, I'm sure glad you are." she told you as she shifted back up onto her hands and knees, pushing her ass into your groin. Feeling your hard member slide between her cheeks, she began moving up and down your length, caressing you with her two thick globes. "Mmmm, c'mon and stick it back in. I want you to fuck me so bad!"

It's not like you really needed the encouragement, but Kelly gave it to you anyway, and you didn't waste anymore time delaying things. Grabbing hold of one of her hips, you positioned the head of your cock against her slit then thrust yourself into her. Her sopping, wet gash offered minimal resistance and accepted half your length with the first thrust and with the next push forward, you were once again fully imbedded into the slick, creamy walls of her womanhood. Well past the point of needing to ease into things, it only took seconds for you to grab hold of both hips and start jack-hammering in and out of her pussy, slamming your cock into her depths and smashing into her cervix over and over.

Kelly's hands clenched into fists around the sheets, knuckles turning white, as she began matching your movements, churning her upturned ass cheeks faster and faster, trying to keep up with your thick pole of cock-flesh that you drove relentlessly into her desire-racked pussy. "Fucking give it to me! Oh I fucking love it!... Ooooohhhh, it feels so goooood!.... I feel you slapping my clit with your big, heavy balls. OHHH YES!... YES!" she screamed as you began fucking her with reckless abandon.

Your cock is bordering on being painfully sore from the two rounds you'd already had, but the benefit of that is you're at no risk of cumming for a third time anytime soon so there's no need to pace yourself. Your breathing becomes labored as you continue to dole out your punishment on her needy cunt and sweat begins to bead up on your brow and chest. Looking down, you can see the sweat making Kelly's tanned back glisten as well, and you get the added visual stimulation of her narrow waist flaring out to her thick, jiggling ass, shaking with every one of your thrusts.

It seems like everything you're doing is perfect for Kelly at this point and it doesn't take long for your sister-in-law's cunt to clamp down around your shaft once again, her wordless screams filling the air as she starts to climax once again, body bucking beneath you. Maintaining your hold on her hips, you drive your cock to the hilt, slamming your head into her cervix and sending bolts of electricity through her loins over and over again. Kelly squeals in overwhelming pleasure and her body roils around you as you continue driving into her, pounding into her with all of your strength, and stretching out the duration of her orgasm. Eventually, unable to form words, she reaches back and begins rapidly tapping your thigh, giving you the signal to finally stop and allowing you to catch your breath.

As she lay beneath you, trembling while trying to recover with your dick still embedded inside her, eyes closed and panting, you take the time to admire her curvaceous backside, the faint tan-lines from her thong bikini bottom directing your eyes downward, you feel yourself stiffen at the thought of what you want to do to her next.

.