Sakura.

"I think I'll take that Neko of yours, just call her in, and have her touch your Sex Note, then write it up for me," Ria said.

"Alright, I'd definitely go for a cat girl Sakura too if I was in your shoes... Figuratively speaking," Naruto said, looking at Ria's feet as he wrote, "Sakura Haruno will come into Naruto Uzumaki's room, and touch the Sex Note. Upon seeing Ria, she will submit to the Erokami for up to five hours a week, to be used at Ria's discretion. Whenever Ria uses any time, Sakura will be exclusively Ria's for the duration, so long as Ria doesn't try to collect on that time in the middle of Sakura having sexual fun with Naruto."

"Hey, are you saying I'd be that much of a bitch?" Ria pouted, having read over Naruto's shoulder.

"Just playing it safe, I'm a bit of a prankster myself, I can see all kinds of angles a mischievous Sex God might try to play," Naruto replied.

"...okay, maybe I would interrupt and hog your **** girls once or twice just for the laughs, but that's still hurtful," she huffed unconvincingly.

Sakura meanwhile opened the door, rubbing sleep out of her eyes, and unconsciously took the Note when Naruto handed it to her.

Sakura blinked as she looked upon Ria. "Um, Naruto, who is this?"