He takes Vivi's ass.

He chuckled and sat back. "Vivi, mount me, but let me place my dick in you," he ordered her.

"Of course Master," she said, getting up partially and crawling into his lap. She began to lower her hips, and her eyes widened as she realized Luffy wasn't aiming his cock at her pussy. "Um... Master?" she asked, but lowered her hips anyway, causing his tip to press against her anus. "I think you have the wrong hole..." Even so, his cock started to penetrate into her.

"Nope, I'm fucking you in the butt," he said, making her gasp in both shock and stimulation as she lowered fully, his dick completely in her rectum. She embraced him, and smiled.

"Alright then... Let's get to it Master," she said, her submissiveness quickly overriding her surprise as she began to ride him.

He leaned forward and kissed her as he bucked his hips, his dick working in and out of her anal opening, and he slid his tongue into her mouth.

She met his tongue with hers, though it submitted immediately, and her rectum tightened as he once again continued to grope her breasts. She squirmed her hips against him, working his shaft as deep in her as it would go.

Alvida joined them on the bed and proceeded to spread her legs where Luffy could see and started to masturbate. With her free hand, she reached up and groped one of her boobs.

Vivi tightened her embrace against Luffy, her anus squeezing and milking him. "Ah... I'm close..." she gasped, breaking the kiss.

He nodded and grabbed her hips, pushing her down and pulling her up at a quick pace, making her whimper in pleasure, before screaming as her ass clamped down into a vice grip. His seed flooded her rectum, and she collapsed against him. "...thank you Master..." she sighed happily.