She began to suck eagerly, wantonly. She kept her lips tight as they gilded up and down his cock, her tongue in constant motion. He fucked the swollen head of his cock into her throat, and each time he did so, Doctor Nancy's cunt would clench with passion. She was going to come, she knew. She always came when a young cock spurted that deliciously thick come juice into her mouth. She loved the creamy taste of come juice, the sweetness of it as it burned down her throat.

She shoved her free hand beneath his pumping little ass, gripping his ass hard, still clinging to his balls. She made whimpering sounds of ecstasy as she sucked as fast and hard as she could.

"Doctor Nancy!" Billy groaned. "I'm gonna come! Ohhh, I'm really gonna come!"

"Mmmm," she moaned, sucking greedily. Her cunt was boiling now. She twisted her ass into his gripping band.

She mewled when she felt his cock swell inside her mouth. The jism splashed across her tongue hotly. She gave a muffled squeal, swallowing hungrily, her lips pulling. She clamped her hot lips about the head of his cock, licking swiftly about his come-spewing piss hole, tasting the sweetness as his come juice came up out of his tight balls and splashed time and again into her mouth. She held his cock in her mouth until he finished, draining his come juice completely.

"That was a real load, honey," she grinned up at him. "I love a big, hot load of come juice like that."

She buttoned her smock, telling him he could get dressed. She finished up on his chart as he pulled his clothes on.

"Now, not a word, honey," she warned him again. "You do what I asked. Peek at your mother and tell me what she does – and I'll suck you off again."

Billy, dressed now, asked in a trembling voice: "Doctor Nancy, can I fuck you, too?"

Doctor Nancy laughed, puffing him between her legs and hugging him tightly. "Of course you can, darling. You're very sweet to ask." She looked up into his face, her hands cupping his ass. "Next time you can fuck me, okay?"