Every normal girl would give a slap this french bitch after what she had done, and a hard one, I should say. Till the last page I understood the idea of this oneshot: spoiled and selfish foreign girl, driven by lust, violates virtuous japanese girl. "Oh, East is East, and West is West, and never the twain shall meet." It's the innocence of the other girl, which attracted her so, after all she always describes Aika as "pure", "angelic", "maiden", all her thoughts are concentrated around Aika's virginity, it's like she is afraid to lose the moment and not be able to fuck her.
This situation would be ruinous for any relationship. It just would led Aika to the mental breakdown. After all, she is a serious christian, wants to enter the convert. I think, the proper ending is for violated Aika to go to the monastery and pray for forgiveness. For Lisa's, of course. Maybe then Lisa would understand, that if you fell for your "sinful desires", it would have consequences.