Volume 8: in chapter 2, two drunkards harass White and grope her chest. A little after, Ariel also does it but it is more treated as a comedic moment than harassment. The incest part is one-sided, Sue has been often depicted as overprotective of her half-brother Schlain and was also implied to be in love with him. This all leads to volume 15 chapter S4 in which Sue drugs and attempts something with him before being stopped by Schlain’s party. (There is an illustration of a half naked Schlain underneath an annoyed Sue in the interlude narrated by Katia following this chapter.)