Yes, it is supposed to happen some other passage at the mistery club, Zorlun had mentioned something about it, aside the "dreams" being influenced by the choice made there, but if you mean sexually and with him, as far as I remember, Zorlun never pointed towards that possibility.Does the guy Stanislas(Guy in library) comes in the game and have storylines with Myriam at later part?
At the end of the day, even in her most "sexually active and open to any and all opportunities" (well, if your prefer "stluttiest"