Why does he do this to me?

OS

Johnathan and Mary twins, out of twist of fate if can call it. Life can be unfair special to him. Why their grandmother was a witch, she basically decedent person. She taught both of them, the craft, but Mary seem to have natural talent for it. Thou Johnathan can do minor things, But Mary high level magic was second to her.

After their training, Mary changes not in a good way. Each time when Mary had a punishment, detention whatever she rare at first spend much time for it.
And Johnathan was the one service it. Not because she asked him, or he was willing to do it for her. She didn't because, she didn't want to serve the punishment, or she to take the rewards and then some.
Each time she said it be the last time it, wasn't. Next, she didn't want to go thou those periods. A bad date or three. Times that, she didn't want to go shopping her mommy because choices of those clothes. TO go to Gynecologist.
It wasn't fair that each time Mary doesn't want to experience the bad to her. So had to experience them for her. I'm probably the only guy knows what feel like to get PMS.
This has been happened on and off for years. Then he had it with her, each time she does want to experience she doesn't like. So, he tells her to go through yourself.
And when I woke up again. I was her again this time she/ I was dressed casually. Mary was there has me again. She decided to teach me a lesson again. She was horny again but this time, she wanted Johnathan to give him a BJ. But Johnathan didn't want to do it. But he had now choice, she nearly forced him to him a BJ. For the next 5 or 10 long minutes. And it was done, lay there on floor.
Next time, I may do it, you as me in the butt, your/my vagina next time.
Please don't, I don't want this anymore.