Fuck, i'm still stucked with the scene with Quinn. All the lewd scenes of the episode were amazing, but the way of happening with Quinn... Man, she's so confused and in trouble, but has no one to rely on, to confort her in some way. She's tired of being that tough and cold girl all the time, even when everything is collapsing around her.
So, when the MC says he want to help her without wanting anything in exchange, she doesn't know how to deal with her own feelings.
The music is just the perfect frame for that painting.