Immediately Marie started humping her asshole onto her big sister's finger, simultaneously rocking her cunt mound onto her sister's mouth. "That's riiiiiight, that's so fucking goooood! Jack me off… unh, fuck… gonna cum!"

Kelly felt herself become increasingly aroused by the driven intensity of her sister's response. Almost violently, she slammed her finger into her sister's throbbing asshole, twisting it deep inside Marie's puckered shitter. At the same time, she sucked hard on Marie's clit, dancing her tongue repeatedly on the ultra-sensitive tip.

"Unngggghhhh!" Marie's face contorted. She started humping much harder, fucking her wet pussy all over Kelly's face. "Suck it suck it for me! Jack off my asshole! Unh! Fuck, Kelly! I'm making it now! My asshole's throbbing! Cuuummmiiinnnggg!"

Kelly felt her sister's whole body grow stiff, her thighs quivering as luscious heat mounted in her loins. Then her shit channel spasmed tightly around her fingers and the pouting lips of her pussy flooded her mouth with fuck juice.

Pussy juice bubbled out of her curly haired cunt slit, as heavy an explosion as a man's squirting cum. Kelly stopped sucking her sister's cunt and burrowed her tongue in Marie's pussy. Eagerly she licked out all the foaming cunt oil, pounding her finger into her burning ass guts.

"Unggghhh! Oh yes, lick me!" Marie kept humping and bucking. "Play with me! Ahhhh!"

Finally totally exhausted, the nymphomaniacal teenager rolled off of her sister's head and collapsed on her back on the bed. For a long time she just rested there, panting as she stared at the ceiling. Then she turned on her side and gave Kelly a long, tongue-sucking kiss.

"That was so fucking bitchin'," she whispered huskily. "You're a really good pussy sucker once you get started, Kelly! We'll do that lots more from now on!"