"Actually, it'll probably be easier to start at the beginning", Mark said, "so you'll get the chance to learn as you grow up." He grabbed the 8 vial from the Age category and poured it down Jessica's throat while she was caught off guard, looking what he was doing. The burn brought tears to her eyes, and she coughed multiple times while the vial began to do its job...
Her breasts were quickly levelled to nothing, and small nipples were the only thing that remained. Her short pubic hair seemed to curl backwards into her skin, along with her defined genital lips, completely smoothing everything out, even her muscles that were being replaced by peachy flesh. Her now much pudgier body seemed to warp in its proportions, the head becoming bigger compared to the body while she lost even more of her size and ultimately stood at about Mark's waist height, her tiny cheeks red with tears from coughing so much. Making use of the vials' temporary stunning effect, Mark picked up the little girl in her giant clothes and took her to the bedroom, where he fumbled through his old wardrobe - he still had all his stuff from when he was a little girl. He got a pair of white panties, light pink shirt, summer shorts and tennis shoes, which he quickly managed to put on Jessica while she was still off this world. After a while, the fully clothed 8 year old Jessica asked in an even higher, now strongly trembling voice:"W-w-w-what are you g-g-going to do w-with me?" and was so visibly shaken that she was almost at the point of crying. "Don't worry, I'm not gonna harm", Mark said to placate Jessica, "we're just gonna have some good clean fun for some time to come. What shall we start with?"