Yes, I think concerning Ellie there are two things that are bound to happen, the shaving and the dildo.Sophia is already comfortable being naked with Ellie, in Sophia's favourite place to masturbate, being caught several times, both by Dylan and Ellie. Ellie's is the route that requires Sophia and Liam not to be having sex, increasing the chances of Sophia actually being horny during the event. Ellie is also one of the few that can get Sophia wet. All Ellie would need would be to convince Sophia that it'd be okay if she masturbated in front of her, same as how Ellie did in the shower next update. There is also the yet to be had conversations about how "intimate shaving" because of how much Sophia enjoys oral.
- I think it is natural to think that during the next shower, if it ever happens or it is planned, there will be something involving the shaving. Ellie was curious before about the subject, so that can be easily an event that could represent the next step in their relationship. Just the shaving alone could be erotic enough for L&P standards, imagine if they go just a little bit farther.
- the dildo has to come up at some point, one way or another. As I said multiple times, it's like in the plays/movies when there is a gun, it is bound to shot before the end. Now there are infinite possibilities for that. It is natural for the course of the story so far that it could be another mother-daughter dialogue about sex-ed like in the shower (but in Ellie's bedroom this time) and then one thing lead to another etc, either to show how to do a bj or more.
Another possibility that intrigues me is with the next next update (0.150) and the Nathalie event. Again, without much surprise, we can image that Nathalie finds the dildo while cleaning (like Sophia did) and starts to play with it. It's true it will be a redo of the previous solo event but this time, who knows, maybe Sophia can be more involved.