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.
I'm sure my sister's recording it, 
so I'll get her to let me watch.
أختي تسجل حلقاته حتماً، لذا سأطلب الحلقات منها
Meine Schwester nimmt den sicher auf,
ich frag sie nach den Folgen.
Mi hermana debería tenerlo grabado.
Ma frangine l’a sûrement enregistré,
Chiederò gli episodi a mia sorella, 
tanto li ha registrati di sicuro.
A minha irmã gravou 
com certeza, aí me empresta.