OK, paid my $10 and played ep 19..... the expected payoff scene with the reds is definitely worth it. They did a good job of letting it play out so you could really admire these beautiful sisters going at it before MC gets involved and turns it into a regular old 3some. Well done.
I played with the variable editor, but all I could really do was change who the 3rd girl on the roof was (basically, you get the two sisters plus whichever sidechick you pick the most) . I've heard there was a possible 4-girl endings but I could not manage it, so that could just be a rumor. Apparently there are also solo endings but, I mean, why would you want to live a life without 3somes with the twins when you have a better option? I was also surprised to see the variable editor wanted to know which girl you imagined Amy banging, since it didn't seem to impact the story (unless I am missing something big....)
A couple loose ends that annoy me-- we never got an explanation about Amy's kidnapping scene, and the unresolved sexual tension between Amy and Morgan really should have been addressed. (I haven't played the epilogues yet; if there is any good in this world one of them has the MC balls deep in Amy's butt while she is face down in Morgan's muff.)