For lovers of kisekae art, the
SPNatI.net game has been going from strength to strength in recent years. The quality level in 2020 is leagues above how it was in 2015!
This game has 153 characters online now, and EACH of these have over one hundred kisekae images in all states of undress: fully clothed, underwear, nude, and everything in between. And they banter with each other like a big crossover game. It's kind of amazing.
If you've never tried the game or haven't for a few years, it's worth a look.