FSDSS-901 - Description of sexual acts involving repetitive vibration and intense stimulation using a machine vibrator, Usui Rika

Usui Rika, a former member of a sexy idol group, is subjected to the relentless assault of a machine vibrator. She's relentlessly pounded, especially around her core, and Rika just loses it. The attack doesn't let up, there's penetration involved, and eventually, she even squirms and fights back. There's even a scene with her hands tied. She's got a pretty face, a great body, a genuinely beautiful woman. This is a masterpiece, seriously. Definitely worth keeping.