[Pixiv] [Megamega] Otona taiken (Adult experience)

A scrawny young boy, tired of his teasing gyaru friend calling him pipsqueak, spots an 'Adult Experience' drug on a pharmacy shelf and figures 100 yen is a bargain for growing up fast. The pill kicks in with a vengeance—his chest balloons into enormous, jiggling breasts, his frame reshapes into a curvy, thick-thighed woman, and a new bulge swells as wave after wave of pleasure crashes through the transformation. What starts as a shortcut to adulthood becomes total surrender, as the shameless new bombshell struts out to show off her stacked body to the very girl who used to pat his head, with showers, makeup, and a very different daily life waiting after.