Back home he decided to age up again by moving forward in time. He wondered what would have changed by that time. He woke up in bed like normal. He moved the blankets and looked at his penis. It had gained it's original girth again but was now even longer by probably 3 inches or so than back when he was younger. He opened the door and saw his now 15 year old youngest stepsister Lisa. Her breasts had continued to grow while her height had not. Before he knew it he had her on his bed topless. His penis rose to an erection. It's massive lenght was monstrous. It was 28 inches long. He stuck it into her cleavage and started rocking back and forth. Even at this size she could bury his penis in her cleavage. He suddenly felt weight on his back and turned around. It was Ashley, now with her new and improved massive implants. As Matt moved away Ashleys breast fell off his back and bounced up and down. They were beyond massive. While fake they had finally beaten Lisa in size she struggled trying to pull off her tight top that hugged those enormous boobs. She suddenly squirted through the top. Matt helped Ashley remove the sweater allowing her chest to be demonstrated in full view. Lisa was still moaning behind matt as she did so. Her unimpressive nipples hadn't changed jilting out as she lactates, they probably couldn't go soft anymore. Her areola seemed to be the same size as before making them seem smaller in comparison.
"My breasts feel so full." She moaned. "Well, you stuffed them full." Matt thought to himself. She bumped into him and let out a louder moan. "I'm so horny..."