Oh Kishi Torajirou, you wonderfully gifted master artist, you... nobody's better than you at visual metaphors for sex.
Y'all remember the Yuu x Mari nookie time at the movie theater, right? In chapter 160:
https://dynasty-scans.com/chapters/virgins_empire_ch160#10
Now, it's Onibi x Mask. And their tryst scene is way, way more sexy! Who'd have thought an undercut could be such a perfect substitute for trimmed pubic hair? Hot lesbian sex FTW!