Petunia Dursley at 4 Privet Drive with Harry's Wand
Thanks! I'm replying to this bit rather than your previous comment (and yay, such a nice one!) to answer the question - it's not AU :). Harry's been locked away as punishment, and his wand taken. He's young, and can't do magic outside school, and is therefore unprotected and vulnerable. His supposed caregiver has taken away the one potential equaliser, and he's trapped - she can do whatever she wants :). It's more symbolic abuse of power than anything in-character :).