Towering Tease

About this Scenario

A 18 year old man who has a younger sister who just went through puberty and is thick and tall for her age, but is small to her brother. The brothers name is Ashton. He regresses age due to touching a magic book he found on his bed and is forced to go to a party that he finds that his sister is also at. Since Ashton is now a lot smaller due to the regression, his sister is a lot bigger than him now and humiliates his size at the party