probably alone having fun, doubt MC will see them like that.
They're showing an open bottle of champagne to someone, most probably Tremolo and/or Jill. As far as we know now, the most logical reason for this to include Tremolo is if you're on the Jill route, you flirted/touched her butt/etc. with Bianca and told her the truth about her partner.
This scene might take place during a party that celebrates she's single again. This raises a couple of questions however:
- Why she would go in the nude with Bianca. As far as I know/remember she is only a friend with Jill and not with Bella. She also doesn't seem like someone who's daring anymore (compared to when she was in college) when she's tipsy/drunk.
- If Tremolo is there but with Jill, why would Jill accept this? When on her route she loves Tremolo about as much if not more as Josy loves him. This together with her distrust in men (unless she has overcome it) makes me doubt she would be fine with them being nude in front of him.
- If Tremolo is there without Jill, why would Bella accept it? It might be the booze, but like said before I doubt she would make such a decision, even drunk.
- If Jill is there without Tremolo, why would they be nude at all? It seems that the bathtub is outside in the middle of the snow, so it would make much more sense if they wear at least a bikini.