Big Tits Theory
Marty tells his sister about a theory he has - the "Big Tits Theory" - while feeding her body-altering, mind-bending milkshakes.
Tags: mt/ft, Ma/ft, Teenagers, Hypnosis, Magic, Mind Control, Heterosexual, Fiction, Incest, Brother, Sister, Anal Sex, Exhibitionism, Masturbation, Oral Sex, Pregnancy, Sex Toys, Tit-Fucking, Voyeurism, Big Breasts, Body Modification, Doctor/Nurse, Public Sex, Teacher/Student, Transformation