Josy and Maya love the MC and they love each other. There will be no problem. Besides, Josy likes threesome sex and Maya also goes in that direction, considering the hot tube scene of EP8.
The decision about the throuple is made at the dorm party. The MC can fuck Maya, but he doesn't have to. If he doesn't, there is no throuple. The MC can dance with Josy, but he doesn't have to. Ergo, it is not good for Josy. However, if the MC dances with Josy, then Josy will probably leave Maya if the MC did not fuck Maya. For that Josy becomes like Elena. Why? Josy loves threesome sex.
Moreover, the Mc already makes another important choice in EP4. The MC should choose in which bed he wants to sleep. If he decides to sleep on the floor, the MC clearly shows that he will not make a choice between Josy and Maya, but his choice is either for Josy/Maya or for neither.