Outers Family Fun
It's not really a series, I just thought these stories belonged together. They're in no order and not really connected or in the same universe necessarily.
Chaperone Haruka/Setsuna, Michiru, Hotaru, Chibiusa [PG]
Even and Odd Hotaru, Haruka, Setsuna, Michiru, mention of Nehellenia [G]
Set of Customs Setsuna, Hotaru, Haruka/Michiru [PG]
Exclusive Setsuna/Haruka/Michiru, Hotaru [PG]
Descriptive Language Setsuna/Michiru [PG]
Failing Hotaru, Setsuna/Haruka/Michiru [PG]
Hurtling Around Setsuna, two Sailor Coleres [PG]
In Time, All Things... Setsuna/Michiru/Haruka, mention of Hotaru and Hotaru's descendants [PG]
Chaperone Haruka/Setsuna, Michiru, Hotaru, Chibiusa [PG]
Even and Odd Hotaru, Haruka, Setsuna, Michiru, mention of Nehellenia [G]
Set of Customs Setsuna, Hotaru, Haruka/Michiru [PG]
Exclusive Setsuna/Haruka/Michiru, Hotaru [PG]
Descriptive Language Setsuna/Michiru [PG]
Failing Hotaru, Setsuna/Haruka/Michiru [PG]
Hurtling Around Setsuna, two Sailor Coleres [PG]
In Time, All Things... Setsuna/Michiru/Haruka, mention of Hotaru and Hotaru's descendants [PG]