VO-024 - Beauty working overtime, caught masturbating

I find this series very useful because the first half features genuine masturbation that doesn't feel staged. I would love it if all past works and, if possible, new releases could be available on DMM. However, the provocative masturbation scenes in the second half don't feel very erotic to me. Isn't the most erotic part of masturbation the expression of a woman completely lost in her own pleasure? For example, if you set a rule where she can't climax for an hour and keep filming her desperate attempts to hold back, that would be incredibly erotic.