Jeff's sister stops time and snaps a photo of Jeff once again and that was enough for Jeff to think this has to stop.
While her sister is asleep, he sneaks out of his room, closing the door and grabs the remote and changes his age back to 16.
All of a sudden his body began to grow, he felt his penis getting bigger, he saw that he was growing taller and his clothes were changing with him. His room changed to what it originally was.
Instead of an infant in her sisters' bedroom, instead, stand a very angry teen. His sister wakes up to see his brother and says "Oh, no..." and Jeff with an evil grin says "Yes." and then...