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.
the milk duct is buried inside, 
so you can't be a mother—
—تُدفَنُ قناةُ فرز الحليب في الدّاخل ولن تكوني حينئذ أمّاً
ist der Milchkanal vergraben
und du kannst keine Mutter sein.
¿Cómo amamantas a tu
 bebé con esos problemas?
ma i capezzoli introflessi bloccano la 
fuoriuscita del latte, quindi puoi scordarti di...
o canal do leite fica enterrado, 
daí não dá para ser mãe—