Awesome, yeah I played regular Mahjongg a few weeks ago but I remember playing Mahjongg Solitaire as a kid! It was a fun little puzzle. Maybe it would work OK for porn, I'm not sure!
There is a game called Otoko Cross: Pretty Boys Mahjong Solitaire. It works decently, you win, clothes come off, but its really held up by Mahjongg solitare just being fun if frustrating at times. Would be more fun with your characters, making comments and getting more and more excited as you get closer to winning or building up a score or something. Maybe if you get close but lose they end up cumming themselves instead of being able to hold it for you to have fun with them.