He fucks Yui while she eats out Sumire.

"Sumire, lie down, and Yui, eat her out," Naruto commanded the two.

"Yes, uh... What was your name?" Yui asked, Sumire also confused as they got into position.

"Oh right, I never told you, I'm Naruto," he grinned as he knelt behind Yui, who nodded and started licking Sumire's snatch.

Sakura had meanwhile had Nae lay on her back and scissor with her while Emiru started to rub her back with her tits. All three of them were cooing and moaning, the two girls giggling a little at Sakura's commands.

Naruto began to finger Yui a little, making her moan into Sumire's folds, before he slid his cock into her from behind, easily sliding in with how wet she was from the springs. He'd have to fuck in hot springs more often, it worked wonders for the experience, and he was soon fucking her at a moderate pace. Yui cooed, loving the sensations. She briefly questioned herself fucking some random guy in the hot springs, but Naruto quickly hit a sweet spot, and she mentally shrugged, returning to working on licking Sumire. It felt too good to stop, so she was going to roll with it without issue.

Naruto groaned as he gave Yui a spank, making her squeal, but she remained compelled to work her tongue into Sumire's snatch, and found herself waving her rear at him, enticing him to spank her a few more times, which he did with no issue.

He briefly noted his clone starting up a loud argument with that asshole who called himself Sai, no doubt to distract him from the sex that was growing in volume before he had a chance to notice.

He chuckled a bit, briefly planning some **** on the jerk once he was done with these four. He pounded into Yui, even as he slapped her ass a few more times, and grunted as he filled her pussy with some seed.

She squealed as she and Sumire came as well, along with Sakura and Nae. "...um... That wasn't a safe time to cum in me," Yui pouted, flipping over.

"Don't worry, I'm using a sterility ninjutsu," Naruto half lied, as it wasn't a ninjutsu, but he was sterile unless he willed otherwise. Again, he loved the Sex Note and its abilities.

"Oh, okay, good," she chuckled nervously, with some relief.