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.
Small, young apples have 
sepals protruding outward,
تمتلك التفاحات الصغيرات سبلات بارزة نحو الخارج
Kleine junge Äpfel haben Sepalen,
die nach außen herausragen,
Las manzanas verdes y pequeñas
 tienen el sépalo prominente
Infatti, le mele hanno il sepalo
 sporgente quando sono acerbe,
Maças pequenas e jovens têm 
sépalas puxadas para fora,