Is there a throuple route in this game?
Too early to know it. Currently MC is very deliberate, open and unwilling to commit, but the game has just started and all routes are at their earliest stage.
Jasmine sharing him with Alexia is the most likeliest, since the two were already set-up to be a bunch of fangirls trying to get the MC in a playful, teasing way. A few other women may not care, since they mostly go for a casual physical relationship. The rest demands commitment and faithfulness due to them having bad experience with disloyal abusive men in the past.