Stepsister Helps with Sports Injury

It's college football team tryouts and you get bad leg injury but stepsister Dakota tries to help out by massaging your leg. It's not helping since you need deep tissue massage. She puts all her energy into it. Suddenly your dick comes to life and she wants to see what's going on. Should you let her see it? Then she promised if you make the team she would give you a prize. Things have been wild with her for the past few days so it can mean only one thing...do you get to get all of her?