I see your point, and Jason's and I'm not saying you guys wrong or something, but on this specific case, with MC and Tiffany there's a power imbalance that would be frowned upon them by the society even if it weren't ilegal, I'm even ignoring the incest option, let's use the official way that Ripples is at the moment, Tiffany is a woman in her forties taking care of a 18 boy that may or may not be adopted, this boy depends on her for house, food, money, well everything, there's a power imbalance, no matter if the 18 pursues the 40 years old or vice versa. The same isn't true for Jessica, Jessica is the same age range as MC so most people wouldn't see it as weird as long no blood relation is present, why? because Jessica has no power imbalance over MC or vice-versa.
By the way I'm not arguing against pursuing Tiff or saying is imoral or anything, my favorite girls on Ripples in order are Jessica, Tiffany and Darci, so two of them were technically incest for me, since I played with the incest patch trough all the game except last update.
On the topic of the morality, I don't think anyone that likes incest games is because they secretly wants to fuck their moms

, and this can be said for most kinks on this site, I know some people thinks otherwise, but I don't think that way and if what I wrote seemed that way I apologize for both of you but that wasn't my intention.
Anyways sorry for the long ramble