I have started two training regimen with my sub. Well, not really sub. I call her my pet, but she is my submissive, so don't take offense all.
The first is orgasm training. She is not allowed to fly completely solo any more. She may play to orgasm with me in chat or on the phone, and she may be with her husband at her own (and his own) discertion, but she is no longer allowed to fall off that edge by herself at all. When I am with her, she tells me when she is close and asks permission to come. I haven't denied her (yet) but I have made her wait, and am working on getting her to come on command. She's doing very well so far. Once or twice we have played "quick O" where I put a stop watch on her from the moment her hand touches herself to the time she goes over. ;-) She's learning very well.
I am also introducing other trainings and games for us to play that serve several purposes. Some give her a chance to please me, some give her skills that will be useful later (knot tying, for example, but in another post). When she is mouthy or a little "too" funny, I punish her by making her hold a pencil or pen in her mouth like a bit. At first she had a huge gag factor, but she is learning to control it, and after our last session, she even thanked me for the opportunity to grow and learn.Aw man, is she good to have.
Point being, O-training is part of our relationship. Not sure where it will go but I'm willing to see how far it will take us.