Your Step Sis is getting married and you surprise her with a private fitting to help her find some clothes for her honeymoon. You've only really just met because you got seperated when you were younger by adoption. You think she's so beautiful and to your surprise she's flirty and wears sexy clothes around you. The private fitting room just so happens to be in a sexy lingerie shop and she asks you to stay while she tries on the nighties. Before trying anything on she sanitises her hands with a spray. Damn she looks smokin in her lingerie and starts getting horny and even more flirty with you. When she starts to grow she checks the spray and it's a growth spray! By the time she tries on the second nighty she's ready to fuck your brains out in this fitting room!