Martha groaned as she gazed down at the couple on the bed. Claire's tits and ass jiggled under the impact of her husband's thrusting prick. The steady hard strokes made the blonde's body quiver.

She moaned and rolled her head from side to side on the pillow. Her thighs rocked to the rhythm of Frank's fucking. She writhed as he reamed out her steaming cunt hole.

"Oh, God! I'm coming!" Claire groaned. "Fuck me hard!"

Martha shivered as she imagined how Claire's cunt must be contracting around her husband's throbbing cock. She feasted her eyes on the pumping motions of Frank's muscular hairy ass.

It was hard to believe she was actually watching her sister and brother-in-law fucking. They were like two lusty animals, romping on the bed. She could see Claire's oozing cunt hole clasping, the rigid pumping prick of her husband.

The tempo of Frank's movements increased flow and Martha could tell that he was nearing his orgasm. The forceful pumping of his cock soon caused Claire to come again. She shuddered and groaned.

"I'm coming!" she cried. "Fuck me! Fuck me hard!"

Frank pounded her juice-drenched cunt. A moment later he stiffened and groaned. Martha quivered as she imagined the hot jets of jism traveling up the length of his cock. She watched the clenching of his ass as he spurted his load inside Claire's pussy.

Soon the couple on the bed was resting in each other's arms. Frank's juice-coated cock slid out of Claire's oozing cunt. He rolled over onto his back, his long wet cock draped limply over his thighs.

Claire rose up on her knees, kissed his lips and then moved her mouth down over his belly and to his crotch. Martha watched in amazement as her sister sucked her husband's wet cock into her mouth.

She licked and slurped over Frank's limp cock and then looked up at him, smacking her lips.