Your Aunt goes looking for you at your house and finds that you have shrunk yourself with your experimental shrinking serum. She starts to ask a lot of questions and becomes embarrassed as she is staring at the size of your cock. she then asks if she can shrink too and you tell her to give a shot. so she does and as she doesnt notice she is shrinking, her clothes start to get bigger and fall off of her and your cock grows in her hand as she is stroking you. She shrinks more and eventually you are taller then her and she experiences the full effect of this.