POV stepmom agrees to show tits to stepson on his birthday

Oh hey there Junior! Yes, I know it is your birthday so happy birthday! What? No, no. That deal we made last year about showing you my tits when you became a man this year was just a joke. Besides, your stepdad might catch us. Oh come on, it was just a joke! Okay okay, I will show you my tits but that is all, okay! Wait now, why are you touching my boobs? Oh my, I am getting so turned on right now. Okay, if you can keep this a secret and make it quick I have an idea.