Wait until they get home?

Josh grabbed her hand, "Sis, I can understand the need to relieve that tension, but right now you're weighing down this car too much. Not only that, but you're also kinda cramped in there as it is. All I'm asking is that you don't relive yourself and grow again until you're out of my car. Deal?" "Ok Josh..." After what seemed like forever, Liz finally got out of the car with her bags of big clothes and went to her room immediately. Josh followed her, and went in her room with her, "Josh, what are you doing in here?" "I... uh.... you..... ummm..." "It's ok if you want to watch me grow, just give me about 5 minutes unless you want to do the honors like last time. It is bigger this time around you know." Josh decided to take her up on the offer. Liz almost immediately got erect, and Josh stroked away. After about 3 minutes of doing so, Liz felt it coming, "Heads up Josh... mmmmmm.... here it comes!" As she said that, she started letting off gallons of cum all over the walls and the ceiling. After finishing, she stood still and started to grow upward. Josh looked up and saw her already gigantic boobs grow along with her already outrageously large nipples which were spewing out milk again (faster than last time). Josh started to turn his head towards her thick, large abs which looked as if someone chiseled deep into her belly. He was admiring it until her half erect penis blocked the way as it was growing even bigger as it was going from erect to flacid. Josh then looked at her legs which he admired as her calves grew to the point where it looked like someone took over-inflated American footballs and shoved them into her calf muscles. Her thighs were also growing steadily. After about a minute, Josh felt a thud followed by an "ow" from Liz. She hit her head on the roof and was still growing. She eventually stopped about 3 minutes later and was in her knees. She said, "Well Josh, I think this is the biggest growth spurt I've had in my life. Let's get outside to see how big this one was." She eventually crawled through the doors and stood up straight when out of the house. Josh got a measuring tape out and a measure. She came in at about 10 feet tall... literally. "Wow Josh, I must be the biggest 19 year old in the world." She said as she flexed her watermelon sized biceps. Her muscular build was on par with the biggest of made bodybuilders. "What do you want to do now, Josh?"