Judging from the screenshots, this mod is a bit incorrect (at least with v.0.5).
In the screenshot 1, the choice to go back or to enter through the entrance doesn't have any further consequences, only those 2 scenes would be a bit different, both including Vanessa and Nina (though focused on them differently).
In this case (screenshot 2):
Code:
menu:
"Ask Sophia to be your partner.":
$ sophiapoints += 1
jump sep12_sophia
"Ask Vanessa to be your partner.":
$ sophiapoints += 1
$ vanessapoints += 1
jump sep12_vanessa
the single best choice is to ask Vanessa. Eventually it would lead to the scene with Sophia too. And choosing Vanessa wouldn't have any adverse consequence for Sophia's path.