MatchaSLR
Simplest would be to reprise Pristine Edge + Lexi Luna as stepmom and aunt. But this time introducing a younger co-star as stepsis. They performed their roles very well and I'm sure nobody would say no to a direct sequel. Can start off again with Pristine+Lexi in part I, then subsequent parts the stepsis joins to "spice things up"
Another "modern relationship" scenario I can think of on top my head is a scene with a MILF Airbnb hostess+ her daughter.
How about a hot mom of a friend? Like this NAVR classic. The possibilities are endless indeed.