For the boy to continue was stupid. He should be punished. He got two years. Clearly, you have issues. Your view of sex is twisted and negative, which discounts your arguments about this case, and rape in general.
Women can change their mind - any time.
Pull out, get out, and don't return. Men can also change their minds. In fact, you have an advantage. You're bigger, you control what goes in - and out. She didn't have the presence of mind or judgemental acumen to assess the situation.