Hibiki and Megumi notice a pervy uncle watching them masturbate, but they have better ideas than chasing him away.
In Scene 1, the two girls lick his nipples and kiss him, then alternate between blowing him and jacking him off until he cums on his stomach.
Scene 2 shows that he still hasn't left the couch, and gets a solo blowjob from Hibiki with lots of slurping sounds. She takes off her blouse and underwear, then stands over his face and gets eaten out before dropping down into a 69. They move over to a wall and she grinds her ass against his cock before letting him in. After some sex she finishes him off with some ball sucking and a handjob.
Scene 3 has uncle in front of the bed, with Megumi asserting herself and grinding through her panties before getting him to lick her as she sits above his face. Megumi switches to a blowjob with lots of tongue work while tweaking his nipples, then rides him cowgirl, gets taken doggystyle, and lets him finish in her open mouth. Uncle tries saying he's tired and wants to go, so she ties him to the bed.
Scene 4: Now that he has nowhere to go, Megumi's free to continue and Hibiki enters. They enthusiastically talk about their catch and look forward to more sex despite his objections. Both lean in and start to kiss him and lick his nipples, then take turns on a blowjob. Hibiki pulls out a plastic sex toy that looks like a closed fist, and uses it to jack him off while Aoi uses a second one that vibrates. They continue applying lube and trying out various toys until he cums with both of them using their hands. The movie fades out with them continuing to 'punish' him for being a perv.