That was also a very old idea of mine.A possibility is an scene similar to the Judgement of París. París (Dylan) has to choose the fairest (or the best boobs) between Hera, Athena and Apdhrodite (Claire, Sophia and Marie, not neccesarily in this order). It's just an idea.
https://f95zone.to/threads/a-wife-and-mother-v0-170-lust-passion.5944/post-6296594
But what speaks against it is that Marie has it simply not necessary, and also no interest, one recognizes clearly during the yoga event, to start in such a competition.
And the two older women would know exactly that they would have no chance against Marie in "reality".
It would be a difficult undertaking for L&P to convince Marie to participate.
And Dylan has in any case the ass card, no matter for whom he decides.
Although the decision for his mother would still be the best. That's the decision the other two women would be most likely to forgive.