Aright, some clarification for those still stuck trying to unlock the .12 and .13 content:
The walkthrough is not quite right, the first thing you need to do is start changing roles.
Next stop having anal with Lisa, and talk to Alice every night on the couch, you will either eat her out or get a blow job. Also, make sure you try to watch a movie with Max’s mom every night it will let you.
Once Max’s mom catches you AND SITS DOWN, resume having anal with Lisa, and talk to Alice every night on the couch to get spanked with Lisa.
Once you get caught by Max’s Mom TWICE (she does not sit down), stop anal with Lisa again.
Keep talking to Alice on the couch and eat her out or get blown until Max’s mom SITS DOWN.
Now you can go talk to Kira. Then Max’s mom at 22:00 or 23:00. You’ll know it is the right scene because the door will be closed and when you open it she will be naked.
You have to stop before she cums 5 TIMES. You will get locked out at random, there does not seem to be a pattern.
A day or two after the 5th time you will be able to talk to Max’s mom again at 22:00 or 23:00, and she will have sex with you.
A couple days later you will be able to do it again, that will unlock the rest of the sex scenes with her.
Eventually you will be able to start convincing her to do Yoga naked if you are on the Lisa Yoga path, and eventually have sex with her during Yoga. It is strongly hinted that in a future version someone, probably Lisa, is going to catch you having sex, but not yet.
Eventually Alice will catch you on the couch, and a couple of other places, and Lisa can catch you in the kitchen. I’m not sure what the triggers are though, I’m still working on it. It might be resuming anal with Lisa.