Dawn opened her full lips and took Steve's dick head inside her mouth. Lucinda gasped again as she saw Dawn's tongue glide out along the thick staff, lapping and circling downward until the older girl's lips were halfway down the throbbing meat-stick and the tip of her tongue was toying with the base of the big cock.
"Uhhhhh, that's right, baby, lick me clean!" Steve groaned. "Lick every drop of your cum off, then eat my cum. And I'm ready, honey. I'm almost ready to shoot off, right now!"
Lucinda's head was spinning, her youthful body lost in a swirl of uncontrollable lust. She couldn't believe that any nice girl would do what Steve asked. But nice girls were not supposed to do any of the other things she had witnessed tonight, Lucinda reminded herself, and Dawn seemed to delight in doing all of them.
"Ummmm, baby, give me a mouthful," Dawn murmured, letting the boy's cock slip from her sucking lips for just a few moments. "Come on, baby brother, really let me have a tummy full of hot cream."
Steve groaned and twisted beneath his sister on the bed, her lewd urgings clearly heating his hot nuts beyond his control. The young stud moaned and rammed his cock upward, skewering his lover's mouth until his nuts rested against her chin and her lips were pressed tight against his prick's furry base.
"Throat?" Steve choked. "Hum me! Tighten it up and hum me!"
Dawn smiled around the cock that split her lips. She nodded, bobbing the boy's dick up and down in the back of her throat, then began humming a slightly off key tune that vibrated his prick deliciously.
"Agghhhhhhhh!" Steve screamed, the veins in his neck standing out like cords of rope as he arched up off the bed and fucked frantically up into her humming mouth.
"Ullppp," Dawn gulped greedily.
The head of Steve's long cock made a visible lump in Dawn's throat as the muscles began working to swallow his jetting load. Lucinda felt her pussy tighten as she watched her sister work again and again to gulp down the flood of cock-cream that Steve was shooting into her throat.