"Oooooh, she's gonna blow him, Tommy!" Debby gasped.

Tommy's jaw tightened as he clenched his teeth. He clenched his fists, as well – one of them on his sister's tit. Her nipple shot out into his palm like a bullet. She placed her hand over his, holding him against her and squirming with excitement.

Rebecca pushed her fist back to the root of his cock-shaft and his cock, ballooned. Her tongue slit out, flicking at the air, all frothy with her slobber. Ducking down, she licked at the tip of his slimy cock-head, pink tongue fucking over his purple cock, and slurping through the foamy cum that drenched his meat.

Tommy shuddered, trembling all through his athletic body, vibrant with desire.

Rebecca raised her head for a moment, savoring that initial taste on her tongue. His cockmeat was succulent and his jism was scrumptious. Her taste buds tingled. Her delicate throat pulsed as she swallowed the slimy tongueful.

"Yummy," she purred.

She ducked down again and began to lick all over his cock-head, lapping up the seepage and replacing it with her saliva. Her mouth was watering for his cock and she slobbered down his stalk, drooling heavily over his tasty snack.

Tommy felt light-headed. So much blood had rushed into his cock that his brain was starved for oxygen. He thought that maybe his sister had been right – that he would simply have to beat his cock under the blanket and get his rocks off. He watched his girlfriend's nimble tongue flash all over Harry's prick-knob and Tommy groaned. He felt as if his eyeballs were going to melt.

"Ooooh! Look what she's doing!" Debby squealed, thrilled to the core by the sight.

Debby had fooled around a little, but she was still a virgin. She had never sucked a cock, although she had often wondered what it might be like. She sometimes fantasized about giving head when she was finger-fucking her own pussy. Watching Rebecca tongue Harry cock was really turning Debby on. She wished that she was with another guy, instead of her brother, longing to sample a mouthful of cock.