I understand that Sofie can be very persuasive, even that she puts all her effort into having a little emotion and show in her bed with the other two girls, but if the other two do not do their part, not even a little , I think it's something impossible, that Sofié, by herself, can get some show.
Naomi, it seems that she will not do anything with Aria, in bed, and Aria, only allows herself to be caressed, but as if the thing was not with her.
Unfortunately Sofie, will not get oil where it does not seem to be.