Looking for Wearebles/Harnesses to spread buttcheeks

Hello everyone,

my girlfriend has a gorgeous bubble butt and I really couldn't be any luckier in this regard. However, sometimes it can get in the way. Usually we're using some kind of "skin-friendly & non-stretchy" tape to spread her buttcheeks, but that doesn't work as well as expected. Sadly, it comes off easily once it gets damp from lubrication and sometimes the location itself can be rather wet, like in the bathtub, the shower or if enemas are (hopefully soon) involved. Other types of tape are out of the question because it either harms her skin or isn't rigid enough.

I've tried looking up solutions through various search engines, but I didn't find anything specifically designed for spreading the buttcheeks. I faintly remember seeing a video a while ago, in which a harness seemed to do that just fine, but it might have just been the position of the model..

So, does anyone know of wearables/harnesses that spread her buttcheeks well enough for anal play and anal sex? We're also open for possible DIY solutions, maybe it doesn't have to be something wearable at all! Bonus points if it can somehow incorporate one or more anal hooks, although I don't think I'll be winning that lottery anytime soon 😄

Thanks in advance!