I wish this was even 1% canon, this ship brings me such joy. my favourite new pairing in years ((I guess technically not new because the manga is older but I didn't read it ok))
I'd advise you to read the manga. It's not canon since it's not yuri (yet? I can dream) but they get progressively closer. And all the promotional stuff puts Bonita and RyoNiji as preferred pairings (reader can take it was they want). So a shipper of any of these is well fed. I have to warn you, tho: manga scanlations are like halfway through the manga (30 chapters vs. 60 chapters in JP), but hopefully the translation team expands with the rise in popularity (it used to be only one person).
The act of a female rubbing her genitals on the genitals of another (does not matter how), especially if they use it when both are close in order to achieve mutual orgasm, will always have a special place in my heart. It is why I made a list for it.