Assfuck

Mary lies back on the bed and spreads her legs, inviting Katy to lick at her moist pussy. Smiling, Katy obliges,getting on her knees, bending over, and giving that cunt a good working over.

You, meanwhile, can't stop looking at that fine asshole she's gyrating enticingly, so you sidle up and place your cockhead at the entrance. She stops what she's doing long enough to moan "stick it in", and then sinks back.

Slowly, you do, sinking your manhood into her anus, as she starts using her fingers on mary's pussy and ass, until you're all the way in.

You start sliding in and out gingerly, enjoying the tightness of her ass, all as she digs her fingers into her sister's holes, while mary kneads her own breasts in the throes of passion.

Oh God, you're gonna cum.