What you're waiting for is the message from Michelle saying it's ok to come over, if you don't go on the day you get it, you'll have to wait till the next one, the reason you have to knock on her door and wait for the next message saying it's ok to come over, is so that the option to ask about the anal training will become available.Jason received the message from Michelle. He has already get the messagge from her
As I've been saying it's a waiting game, you have to wait for Michelle to send you the message, the message that would be still receiving even if you did not knock on her door, you just won't get the option to ask her about Anal Training, which is the reason you need to knock on her door and as her about anal training first.