LHTD-007 - Timer vibrator extreme experiment, no girl can last over 10 minutes

Riku and Yuuna are total opposites. Riku twists her legs and feels it whether the vibrator is on or off, and she even wants a timer to pause it (because she keeps orgasming when it's on). On the other hand, Yuuna keeps her legs perfectly still and waits for the vibrator to be turned on. From their reactions to the changes in their faces after they climax, I ended up watching the whole thing from start to finish. There's no sex, but it was incredibly erotic.