You fucked up. You thought you could get your student to rest with you by threatening her grades but she wasn't having any of it. Instead of being afraid she was aggressive and told you that she'd be telling the principle and your wife unless you gave her everything she wanted. Those things? As for the rest of the year and you to be her little foot bitch massaging her feet everyday. She didn't realize you had a foot fetish though and when she found out she started humiliating you even more.