He pops a boner

Just as he feared: he got a raging erection. No woman was safe from his unrestrained lust, not in such a permissive environment. Acting on prior instructions, 'Kushina' helps Naruto masturbate with a reacharound. The shame and lust fuel his actions, but there was still something missing he'd need to get off to this. After several minutes, Rangiku walked up to the bed, now wearing a black bathrobe with a pink towel over her shoulders, and commented in response to what she'd watched for longer than he noticed.

"Room for one more?"

Naruto undid the jutsu out of sheer humiliation. Despite this, or even because of the guilt, his cock remained painfully stiff.

"So I presume that was supposed to be your mother? She was right you know, about sexual taboos here. You're practically encouraged to overcome the limits of the outside world's morality. Every mother in this village is their son's sex **** when possible. Indulge your fantasies, and use whoever you want to support them. I especially got really horny. Order me."

Naruto observed the wetness between her legs and made a decision with the little head.

"Use a transformation jutsu and become my mother, Kushina. Serve me like I'm your only beloved son."

Getting naked once again, she follows his order to the letter. Before him was Kushina, nude save for that collar. She started stroking him.

"Naruto-sama, your cock got so hard for mommy. It's been so long since I've had a cock inside me. See how wet you've made mommy? What do you want to do to me first, my sweet boy?"

He grabs her tits, playing with the nipples before sucking on them.

"You miss my milk? Suckle all you want sweetie, but if you want me to lactate, you'll have to knock me up and wait. In the meantime, I could suck out your dick milk."

She started to suck his cock and he held onto her hair as she deepthroated him with ease. The hair of a proud woman, important to her life story, now the blowjob handle of a shameless whore. He couldn't hold it in much longer and **** his cock all the way in as he came down her throat. She got every drop before coming up for air.

"That was delicious son, now use your still stiff cock and return to your pussy of origin. Fill my womb once again. You're the man of the house now and mommy needs to be fucked by her man."

He clings to her as he uses her pussy, nuzzling between her breasts as he humped away. She made such a slutty face it would have rendered even his real mother unrecognizable.

"Mess me up son. Turn me into your personal fuckdoll. Plant your seed in my womb. You're my one and only beloved son and it's my duty and privilege to serve you. Thank you for making me your sex ****."

He could barely hold it in anymore, then he gave her a deep lovers kiss before he creampied her. They spooned for a while, his cock plugging her hole, and eventually took a nap shortly before the others got back. Fortunately for them, Rangiku changed back before then. Things were awkward enough around here.