Responses
I think some he was needed to forward the plot. Since the yaoi isn't that long. The author probably had to speed up some parts of it so she put in the cousin to spice it up. I think he should of gotten some kind of punishment...
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That cousin repeatedly molested Kaede. If he was trying to help he would have talked to Ren about mistreating his partner, but instead he chose what he chose, and it was all forgotten. For example if it was say his Dad led there in the same position, would he have taken that option to 'help' because no one was around... repeatedly... i think not.