Some old ones I found that maybe people have ideas for now:
Omaeda's point of view on how Soi is different because of Yoruichi, or how Soi is different around Yoruichi.
Kisuke, Kuukaku, Unohana, Ukitake, or Shunsui reminiscing about Soi and Yoruichi's relationship.
Yoruichi meeting Suzumebachi in Soi's presence.
Captain Soifon's guide on where NOT to be intimate (AKA Yoruichi and Soifon caught together in an intimate moment).