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.
You can be a mother, even if 
you have inverted nipples!
يمكنك أن تصبحي أماً حتى بحلمات مقلوبة
Du kannst eine Mutter sein, auch wenn
deine Nippel nach innen wachsen!
Puedes ser madre aun 
teniendo los pezones invertidos.
Même avec des mamelons inversés !
Puoi diventare mamma
 anche sei hai i capezzoli introflessi!
...mãe, mesmo com mamilos invertidos!