She licked the tip of his cock.

Shoko grinned at Kenji and, locking her eyes with his, stuck her tongue out as she pulled his cock towards her mouth. He began to protest when she licked the tip of his cock.

"I need to know if fellatio helps you ejaculate, Mr. Kataoka," Shoko scolded him.

"If this is for science then I guess it is okay, doctor," he stammered. This was not cheating if the doctor is trying to help him get his wife pregnant he thought.

"Yes, for science, Mr. Kataoka," she smirked and then ran her tongue along the underside of his veiny shaft from his balls to the bulbous tip.

Kenji kept telling himself that he was doing this for his wife while he stared at the beautiful doctor take his cock head into her mouth. He betrayed himself when he let out a moan when she twirled her tongue around his mushroom tip.

He let out another moan, but one of disappointment, when she pulled his cock out of her warm, moist mouth. She smiled at that.

"Please let me know when you are going to ejaculate, Mr. Kataoka," Shoko asked before wrapping her lips around the tip of his cock again.

He nodded and watched her wrap one hand around his thick shaft and the other cupping his balls. He groaned when she started to stroke him while fondling his testicles and sucking on his cock head.

After several minutes of excruciating pleasure Shoko stopped and popped his cock from her lips. "How do you feel, Mr. Kataoka?" she asked, still stroking his shaft in her hand.

"Good," he embarrassingly admitted.

"But do you feel like cumming?"

He shook his head.

"Hmm," she thought for a moment before taking his cock into her mouth again. Kenji thought she would continue to stroke him but instead she grabbed the base of his shaft and slowly swallowed his cock. He stared at the top of her head as he felt his cock slid past her mouth and down into her throat, amazed that any woman could do such a feat.

"Oh," he groaned when she started to bob her head up and down his thick shaft.