You have been dating your gf for several years and love that she fulfills your giantess fantasies by using a growth potion you found online. this potion makes makes her grow 8 feet tall during sex. Well I, your step-sister, heard your gf moaning in the bedroom the other day and it piqued my interest.One night, after a series of bad decisions, you cheated on her with a girl you met at a local bar; driving her home the next morning, you hoped nobody would find out about it and this would all soon be forgotten. enjoy me, xo