SPOILER WARNING!!!!! Played through the game and got to the point you finally fuck sash at which point you get a message saying you got to the point where the routes start to branch and you can select solo routes or harem however when i selected harem it skipped to a movie night where you have a flash back with miracle and Sabrina what looks like a threesome? Am i missing something?

Yes because the arrogantly self-proclaimed "SuperWriter" author of this AVN actually split this linear story into parts to give the illusion that he created multiple routes whereas he actually split one route into confusing parts as I explained there.