Mina and Kushina paid the knocking no mind initially, but when the door swung open to let their handsome blue-eyed hunk of a son walk in they immediately became much more focused on their visitor. The two women blushed under their son's gaze, getting immensely turned on by the fact that he had walked in on them having sex, and as a result their fucking gained even more vigor.
Naruto blushed at the sight of his parents having sex, and he felt a certain embarrassing stiffness between his legs from the gorgeous view he was getting of their criminally hot bodies. But his arousal was mastered by annoyance, and he scowled.
"Mom!" he said. "Ma! Do you two really have to be so loud so early in the morning?!"
Kushina smirked, seeing the sizable tent in the young man's boxers. She gave her son a come-hither look, angling her torso to give him the best possible view of her tits as they bounced and jiggled from the rocking of her body as she scissored Mina.
"You're welcome to join us," she purred huskily, winking at him. "The more the merrier!" And then she came from fucking her lover, and she moaned loudly, intentionally making the lewdest noises she could manage.
Naruto's face grew flush, and he tried hard not to stare at either of his mothers' racks or cunts even as his member further stiffened. He did not humor them with a response, though it would certainly seem he was tempted.
Mina smiled, seeing the bulge in Naruto's boxers growing even larger. She was soaking wet at the thought of getting her hands on the boy's cock, and just thinking about having his meat inside of her made her violently orgasm. She wailed, throwing her head back and rubbing her huge tits as her juices splashed all over her lover's thighs.
Looking into her son's eyes, bathing in the warm afterglow of orgasm, Mina happily spread the lips of her and Kushina's pussies, wiggling their juicy hips.
"Come in," she said lustily, the meaning of her words obvious. "It's nice and cozy inside."
Naruto, blushing with his gaze affixed to his mothers' pussies and his erection straining against the confines of his boxers, nonetheless still managed to gather enough wit to say: "Looks like a tight fit."
Kushina giggled. "Oh, but I'm sure you'll be able to slip right in without any problems."
All three of them grinned, enjoying themselves. This kind of battle of innuendos was quite common in the Uzumaki household, and they were all rather good at it. But still, Kushina and Mina would not be satisfied with just innuendo. They wanted him to fuck them. They longed to have sex with their son.
And perhaps this got across in their words, because soon they found that Naruto was paying less attention to their questionable game and more to the naked bodies of his mothers. His face was red and he was sweating, and all of this delighted Mina and Kushina.
Soon enough, Naruto's erection grew too large to be contained, ripping his boxers at the seams. The now useless garment fell to the floor, and Naruto's cock stood at attention, easily one of the biggest and hardest things his moms had ever seen.
What happened next?