Is this going to be a mindless slut simulator?
Your past games handled it really well - It was the old man who initiated the groping and molestation. It didn't happen because the girl wanted him to touch her. The old pervert took the lead - he looked the pretty girl and decided to try his luck - not because the girl allowed it
He started by molesting her, but the girl also enjoys his technique, so it becomes a mutual foreplay. In this version, Ellie acts like a slut from the beginning and entices him which sucks the fun out of it
If everything becomes consensual and initiated by Ellie then there's no "surprise factor". The NPCs like the homeless or beggars forced themselves on the girl when she interacted with them - this is what made it fun - if Ellie willingly does it then it's no fun