I don't see a problem with that. Even if you chose Sage on the path of Dik, then most likely you had a good relationship with Quinn. Therefore, even if Sage gets angry for some reason and she break up with the player, there will always be Quinn who will be ready to take MС back. At least if the player had a threesome with Sage and Quinn, Quinn is present on the final banner of important сhoices.
In this case, there is no point in choosing Sage at all in the ending on the way of Dik and Jade, you will break up anyway. But at the same time, if you take the path of Others, Sage will still be waiting for you even if you fuck her mother, lol.