That's the issue here, really. It's hard (impossible?) to do "sharing" when the MC isn't physically there to share. That's (presumably) why the "share" and the "cuck" paths look pretty much identical - there may be some dialogue changes that I've not looked closely enough to see, but I've not seen any content differences.
Otherwise, the difference in this scenario, for me, should be about the consent part of it, and it maybe comes into the humiliation bit. Here, I would expect her to drive it on the cuck path and him to drive it on the share path.