The prison scene sure has everyone's attention.
Here's something to think about if your version of Sophia is on the Filthy Route: this is one of the first opportunities we've had to interact with an unrelated man in a sexually charged situation.
Think about that.
After all of the updates, over all of these years, most of the men that Sophia has had to deal with are either related (by blood or other relationship), young, or professional associates. Since the movers, I don't believe there has been a man in Sophia's life that doesn't fall into one of those categories. Larry is the rare man that is purely someone outside of her social sphere, and that does change things. While nothing about this situation is "normal", Sophia also isn't limited by societal expectations like she is with the other men in her life. Larry is a blank slate, the rules of their relationship are not written yet. Not even DeShawn is as removed from her social sphere as Larry is.
I look at her interaction with Larry as the first opportunity we've had to see just how corrupted she has become. As I see it, the insinuations are clear:
1. Sophia isn't as innocent as we have been led to believe.
2. The taboo nature of her other relationships are the primary issue holding her back.
I've seen a few people mention how it doesn't make sense to them that Sophia would be so aggressive with Larry when she has rejected/fought against relationships with other men that she knows better. But clearly L&P is telling us that the taboos of incest and age are not going to be brushed aside easily. At the same time, Sophia is not a woman without desires and a sultry (not sluty!) side. When given the opportunity to be playful with an unrelated man who desires her, she wasn't appalled. The corruption is taking its toll. This is what we've been waiting for, it's just happening in a way that we didn't expect.
This leads me to believe that the first man to have sex with her that isn't Liam will be someone unrelated and older. Sam, Dylan, Aiden, Zach, etc, I think are out of the running. The pathway to her cheating now goes through the Morello plotline. She wants a man, not a boy, and frankly I think that makes total sense.
Perhaps too many of us have become too accustomed to incest storylines, but it seems L&P is digging in against the idea that incest will come easy. If you're into the realism of this story, this makes complete sense.
There's another benefit to this. It gives Sophia as a character more agency over her story. Instead of being the damsel in distress that is being corrupted, she is a woman who is owning her sexuality. That doesn't mean she's going to fuck everyone in sight, but it does make her a more interesting character. Instead of her constant hemming and hawing over her odd sexual interactions with her kids, we finally have a chance to see Sophia being assertive and proactive in her own story.
The problem with this thought is that L&P didn't really lay much ground work for it. I still maintain my poor opinion of this update.