I want to see her a bit more grown up than other depictions so far. Cay would be shown lying down on a bed - fully clothed, minus one shoe that she's kicked off in a hurry. The top front of her dress would be unbuttoned; exposing her chest. She'd be looking at a photograph she'd hold up in the air in her right hand, probably showing Abby. Her left hand... well, she'd be busy pleasing herself with it, one way or the other - I don't mind which. She'd seem ashamed of what she's doing, but helplessly doing it anyway.
I think the perspective would look better as if "seen from above" or something. But more of a side-view is OK too; whichever works. I'd really like to see a rough sketch before getting further into thinking about this..! :'3
Background: Er... just enough to make it clear that she's on a bed, I guess!