Kelly twirled her tongue in and around her sister's throbbing fuck hole, making little smacking sounds as she lapped up the fragrant juices gushing out of Marie's cunt. Then she pressed her tongue on her cunt bud. Immediately Marie started humping, grasping and pulling Kelly's hair as she fucked her horny cunt all over her sister's face.

"Oh, fuck it, oooooh, fuck!" Marie bit her lip as she ground her cunt on Kelly's tongue, rocking her ass up and down. "Suck it," she hissed. "Put it in your mouth and fucking suck on it!"

Kelly rubbed her thighs together as she gave her sister head. By now her own pussy was so wet that she was afraid her fuck oil would foam out onto the mattress. Hornily she pulled apart Marie's ass cheeks, teasing her as her tongue danced across her arching cunt.

"Suck it, suck it for me!"

Kelly wrapped her lips around her little sister's clit. She sucked hard, pulling Marie's cunt out with her lips. At the same time, she pulled one hand from her bucking ass and slipped a finger deep inside her clinging cunt.

"Nnnnnggggg!" Marie humped harder, making her pussy muscles contract around the probing finger. "Oh, Kelly! I want you to jack off my asshole!"

"Wh-what!" Kelly was so astonished that she took her lips from her sister's throbbing clit.

"You heard me!" Hissing at her, Marie grabbed her hand and directed it between her ass cheeks. "My asshole gets horny too! Play with it! Jack it off!"

Kelly gasped, feeling her finger touching the small puckered ring. Never in her life had Kelly connected her asshole and sex, and the thought of fingering Marie's rubbery asshole would have disgusted her five minutes earlier.

But a strange, wanton heat had come over her, and she realized how utterly she'd succumbed to its spell. Returning her lips to Marie's swollen cunt. Kelly shamefully stabbed her finger into her small shit ring, burying it to the knuckle in the forbidden heat of her asshole.