Futaba is a nymphomaniac

Akira felt the ring spinning on his finger before he even realized he had spun it. The desire had come to him so naturally that he didn't even stop to consider it. As the ring came to a natural stop, he looked up at his friend.

At first, nothing seemed to happen. Futaba was just sitting there, taking a sip from her water. There was enough of a pause that Akira had to wonder if the wish he made had even come true. But as Futaba set down her glass, Akira noticed a blush spreading across her cheeks. She looked up to meet Akira's gaze, and her blush only deepened. Her expression was hard to read, almost like a sudden shock had just come across her whole body. Her nipples hardened further, coming completely visible under her top.

And then... she started grinding. Futaba rolled her hips in a fluid motion, making her crotch grind on the hard wooden stool. She gripped the bar to stabilize herself as she kept trying to get some friction against her pussy.

"F... Fuck.." she breathed out, starting to pant.

Akira watched his petite friend try desperately to get some relief, and he couldn't help but stare as her large tits bounced with the motions.

"What's going on Futaba?" Akira asked, trying to feign ignorance while his cock started to strain his pants.

"H-H-How should I know!?" Futaba stammered as she kept grinding on the stool. One of her hands went up to cup her large tit, pinching her nipple hard through the fabric. But it wasn't enough. She whispered "Fuck it..." in desperation as she yanked down the strap to her tanktop, letting one of her tits bounce out freely right in front of Akira. She grabbed the free breast and pinched her nipple between two fingers, letting out a deep and hungry moan.

"A-Akira~ I'm sorry I just... fuck! I need this! I need more!" Futaba begged, leaning back and spreading her legs on instinct. Akira was stunned silent as his friend was fucking herself right in front of him, not caring at all that he was seeing her this lewd.