Galko's skin got really dark as a result of tanning.
Otako comments that since Galko's skin has tanned so much, her nipples must be dark as well. Along with Ojou, Otako yells that Galko has dark nipples.
More than anyone, you know that 
she isn't that kind of girl.
أنتِ أكثر من يعرف بأنّها ليست من ذاك الصنف من الفتيات
Du weißt besser als jede andere,
dass sie nicht so ist.
Eres quien la conoce mejor
 y sabes que nunca haría eso.
Lo sai meglio di chiunque altro che
 non è quel tipo di ragazza.
Ela não é dessas, você sabe muito bem.