Hello there,
did you talk with Emma for her to help?
If you shared her with Mario OR if you haven't have sex twice with her, she wont help you.
The most probable thing that I'm expecting happened is you selected: "do you know your ___ fucks a lot of sluts" during the second sex scene with Emma at the sauna, which is the share choice. And since you had told Mario you wouldnt help him, and Sofia is expecting Emma to help then the quest is basically in Limbo.
The quest will have some changes later about this choices, to prevent this kinds of "limbo" situations from happening. Another example would be to not share Emma but tell Mario about Sofia (this is another limbo state)