I'm hoping for a voyeur approach rather than NTR. As I understand it, it is Dylan himself who is trying to bring his mother together with others in order to have something to watch. As long as he have an influence I don't think it's NTR.
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Also, I think L&P's reference to a cuckold is a misuse of the word. There would have to be an romantic relationship between Dylan and Sophia for him to be a cuckold and this kind of relationship seems to be part of the other path, if I understand it correct. As I said, my guess is a voyuer approach. Most likely very equal to the way we've seen Dylan do it a few times now, but just more extrem.