Have her tit fuck him.

"Anko, why don't you lower yourself down and wrap those boobs of yours around my dick, I wanna see how they now feel," Naruto said.

"Yesss Massster," she replied, playfully imitating a snake hiss as she eagerly lowered herself down, putting his dick between her breasts. He felt there was a line of scales between them as they settled, but they were soft around the edges, so as not to irritate a cock that went there, but instead to stimulate. The Sex Note designed this form around his specifications to ensure sex would be had in mind, which Naruto had kinda expected.

She pressed her tits together, and began to move her torso up and down, finding herself far more dextrous than before, and able to work more efficiently on it.

Naruto moaned as his cock twitched between her tits, new to the sensations of these softened scales lightly scraping along his length. While most of her breasts were still covered in human skin, there were scales where they could add the most stimulation.

Anko smiled softly, glad her new body was to her new sexual owner's satisfaction, and elongated her tongue down to lick the tip of his cock once more, while still looking up at him.

He met her eyes as she worked her tits like a pussy on her shaft, and stared into the altered orbs, but even with the differences, he could clearly see the love and devotion she now had for him. He then looked down as he felt her lower tail wrap a little around his legs, not enough to bind, that was not for her to do to her Master unless ordered, but rather to embrace. She could wrap up his other slaves later...

He grinned and moaned as he came, coating her long tongue and her chest with his seed, which she eagerly licked up.

"Mmm, so good Master," she cooed. "How do you want to use me next? My new body, and old should it fancy you, are yours, to use however you like," she grinned, somehow loving the fact that she couldn't say no to him. She put her hands behind her head and swayed her torso in a manner only made possible by her new lower half to advertise herself and her subservience.

He smiled, considering what next.