A new monitoring project is born with the full cooperation of a certain rock bath facility in Tokyo! Can you steal away the boyfriend from a couple enjoying a rock bath without his girlfriend finding out?! At first, he's confused and shy, but the thrill of something never experienced before gets him incredibly excited! Suppressing his voice so his girlfriend next to him won't notice, 'Ahh! I'm gonna cum...' His body is drenched in sweat, his pussy soaked, and he can't hold back any longer—raw insertion! Slow piston strokes... too good to resist going harder... 'Shit! Shit! She's gonna find out!'
