I really enjoy the game. One thing I noticed, in the gallery for the threesome only the "basic" scenes are available, the others for when you have higher acceptance are missing.
Oh. I just noticed, when i go to the save where i completed the quest it shows just fine.
I have started an fresh save afterwards, and there it doesn't show, but it is most likely because the acceptance is not high enough there.
For clarification I am talking form the scenes in the memories section of the game.