Okay, I believe that I participated in four of the five previous listing Challenges, so I'm qualified to participate in this one.
Since the 'Greek' (fraternity and/or sorority) category was never included, I've decided to employ it in my list here. Self-plugging is apparently encouraged in this Challenge, so I have included one of my own stories.
My selections, predictably all sorority-based:
"Sorority" by Flatfish [Fs/Fs, medium length]One of the Omicron Mu Gamma ("OMG") sorority's wealthy former members plays a clever deathbed trick on her one-time house's current membership, with results which are devastating to those sisters' tender derrieres. There's a clever 'twist' ending to this account of from-beyond-the-grave practical joking.
"Ya Know? Sorority Spanking" by otkgirl [F/F, fairly short]Lesbian romance between two sorority sisters is at the center of this rather serious story of hurt feelings about impending separation, how they negatively affect one partner's behavior, then how her misconduct is dealt with by her disciplinary lover.
"Phi Gamma Delta" Part One by Seegee [Fs/Fs, very long]This first part of the serial introduces four pledges, matches each of them up with her 'big sister' and of course gets each one spanked on numerous occasions (some more than others). However, in this highly paddling-oriented sorority, no sister's bare bottom escapes a good solid dose of the paddle for very long.
"...Perfect!" by Sir Cambornek [Fs/Fs, fairly short]In this sequel to "Practice," which ideally should be read first, a dozen tricked sorority pledges employ trickery of their own to retaliate against the older sisters who had manipulated them. Naturally, this retribution is carried out via a sturdy paddle atop the bare behinds of their two highly regretful manipulators.
"The Delta Tau Solution" by KD Pierre [Ffs/F, long]This account centers on a recently-graduated former sorority member who shares an aspect of Delta Tau's paddling policy as relates to cheating in a contest, only to have it literally 'smack her on the butt' when her teenage sister and some sleepover-guest girlfriends catch the young woman herself engaging in an unusual form of cheating. This intensive nude chastisement ends up being extremely extended, and leads to a later long-term disciplinary arrangement.
"Sorority House Spanking" by Crimson Kid [F/F, Fs/M, fairly short]This narrative is an attempt by myself to replicate the type of spanking letter which appeared in "MR." magazine during the 1970s and early '80s, many of which were probably written by the magazine's staff. A dating pledge faces discipline for returning to her sorority house after curfew--since it's due to her male escort's arrogance, he decides to play 'Tom Sawyer' for her and receives much more severe corporal correction than he anticipated.
Sorority spankings of the bare-bottom kind have always greatly appealed to me...

--C.K.