SDJS-209 - Selection of female employees with large buttocks! Originally intended as a study for developing an anal stimulation device, it unexpectedly led to actual vaginal insertion during sensitivity comparison tests of a specific brand's device! A thorough investigation of the softness, movement, and sensitivity of 4 women with large buttocks.

I didn't realize this work would be so focused on the butt. It's definitely worth watching just to appreciate it. A true masterpiece, I gotta say.

Watching those beautiful older women shake their butts for masturbation development was a real turn-on. And all the actresses had firm, gorgeous asses, so you *know* it was intense.

Everyone had such bouncy butts, you could tell how good it would feel to massage them. I started watching for Yatsuki, but before I knew it, I was rewatching Iguchi. I'd definitely like to see solos from Ishizaki and Nakamaru too, though.

I was hoping for a better balance between face and butt. The beginning focused a lot on the butt without much face, and unfortunately, none of the butts were really my type. I did like the camera angle from directly under the glass plate, though.

Yazaki-san is truly a work of art. She gets so turned on with the dildo, her pussy becomes so wet and glistening, and then they spread her cheeks and insert a vibrator. That ass is just stunning. Around 1:10, Yazaki-san's sex scene begins. She takes off her skirt, revealing blue T-back and stockings, and performs oral sex while standing. Yazaki-san's ass and legs are beautiful. Penetration is done from behind while standing, pushing the T-back up. In the cowgirl position, the angle from behind the balls gives an amazing view of Yazaki-san's perfect ass. Finally, she's fucked from behind and they finish. I was jerking off in the living room, and my wife just happened to be watching. And then I ended up cumming with the actor! Just to clarify, I was using a condom while masturbating.