If you choose the NTR route,the video will show Amanda facefucking herself on Oliver's cock, and him enjoying it. No blackmail on either side with that route, just two people enjoying their betrayal of their mutual best friend. Everything else basically plays out the same as the non-NTR route. IIRC both of them still try to convince Ronny that the other is blackmailing them. The end screen micojive was referring to comes up right after that last screenshot you posted. It's just a teaser for next update with some vague plot points.
I forget if it happens on both routes, but at least the non-NTR route has Ronny tell Oliver, in no uncertain terms, that he's over Amanda, and no longer loves or cares about her. He even tells Oliver to go give her the blackmailed goodbye fuck. It seems to me that in the next update, the main difference between NTR and non-NTR routes will boil down to whether Ronny still considers Oliver a friend or not. In the non-NTR route, Oliver was actually being a pretty good friend. He kept as much distance from Amanda as he could, despite her blackmailing, and warned Ronny about her manipulative nature. On the NTR route he is basically just a backstabbing douchebag, and may end up as an antagonist to Ronny and his future harem.