I know Ellen is just a side character, but I really wish you'd incorporate something more for us to do with/to her. Maybe a few more repeatable sex positions in places other than the bar, her room, or a quickie next to her desk. How about utilizing the washroom for some sexperiences with her?
I'd also like to see her really loosen up and finally let us creampie her, and maybe even a little anal action.
Just a few suggestions. Other than those few suggestions, I'm really loving the whole story and world you've created.