GYAZ-020 - Women standing naked, masturbating until their knees give out

The title is 'Standing,' but she leans against the wall halfway through? That's a no-go. That's a huge minus point. The masturbation scenes themselves were good, with more internal ejaculation than I expected. I don't know her name, but the second-to-last girl was really into it, and the wet sounds were great. Aside from Mimi Asuka, the other actresses were mediocre. They would've been better off just using amateurs.