Emma:
She is introduced into the story as a somewhat insecure teenager. Still interpreting the kiss for Sophia as a possible bisexual crush, Emma is the perfect candidate for seduction when Sophia's transformation into a predator is complete. If she doesn't care that Emma is actually Dylan's girlfriend.
Marie:
Marie is introduced as a character-driven young woman. She is the only one who behaves like an adult during the yoga event. She does not seem to have lesbian interests. Although Sophia seems interested in her, this interest is not reciprocated in any way so far.
Thus, it seems rather difficult to me, at the moment, to construct a sexual interaction involving Sophia and Marie.
But, L&P has proven that its characters can turn 180 degrees within an event, or evolve quickly. Besides, this is a porn game and so the priority is not continuity and slow character development. Therefore, my assessment is not worth a cent.