Your StepAunt's Favourite

You're having pizza and movie night with your stepbrother and stepaunt whilst your stepparents are away, but your stepbrother's eaten too much and takes himself off to bed, leaving you two alone. She admits your stepmom told her your secret - that you and your stepbrother have a crush on her, and its a shame he had to go to bed because she was going to let the both of you finally get what you always wanted: her. Don't tell him in case he gets jealous, but you can still have her if you want? You're not expecting her to come on so strong and you do want it but you suddenly feel nervous. You admit you've not actually done anything before and she's surprised, but not turned off. On the contrary, she starts to take control and decides that tonight she'll be the one to give you your first one-on-one lesson in female anatomy. Don't be shy, you couldn't possibly disappoint her. This is so taboo and wrong that she's almost on the edge already...