I don't think anything like that ever happens or has an occasion to happen with the four of them (timing with the house being built and how by the time sakura starts not wanting to share a bed with her boyfriends or worrying about what they get up to when she's not around there's the baby to take care of, and how close i see the four of them -- mostly Tenten isn't super close in that particular way and Hinata has never been on a sleepover in her life due to how blahblah Hyuugas Don't Do That and how she never wanted to presume by inviting people) and my tired brain won't come up with anything brand new, but for all-girls interaction there IS the ... what is it called, the stag party before a marriage, but for girls. XD Anyway it's on the list of things to be written eventually, i hope that'll work for you when i get around to it.