Same . . I can't seem to get the last Rion scene, though in the evil/solo route, I did get a scene after you force Rion into a GB where you can search another room in the house where Nora is keeping you and Maddie. In that extra room, you find Maddie's stolen items, and then you find Rion hiding, and there is an option for additional sex scene with Rion that doesn't show up in the Gallery.
In the Rion Romance/Lust routes, I end up in a room with Rion in the bathroom, but when I click on the bathroom door, there is a "Join Her" option that is grayed out/unavailable. Anyone know how to enable that option?