Basing on translator's note, they should rather be translated as "Reimu's bitches".
Want to come over to my place?Hey, Cirno.Yeaaah!I hope you don't know what it actually means...Aaah... that expression is totally out..."Out" is said in katakana English.Haha...But still...You know, I'd rather have a seat with a good cup of tea....when I'm having a chat with a friend.We are Reimu's Balls Sisters!Cirno, being a nineball, chose an ambiguous pronunciation for the kanji for bullet. She pronounces 弾 as "Tama", which sounds like "Balls" (as in the family jewels.) instead. The pronunciation "Tama" for 弾 can also refer to Geisha.
In both cases, it sounds like both Cirno and Remilia are Reimu's mistresses/escorts/call-girls.
Cirno meant to say "Danmaku Sisters" instead. In this case, 弾 is prounced as "Dan", and unambiguously refers to "bullet".Okay?Eh?
