Jeff stripped naked and began masturbating on Janice's chair as he watch his sisters use the Chronivac again to make fucking more intense and interesting.
Jeff saw Gabriel, Janice, and Amber start to grow larger. He saw Gabriel's hips widen making room for two more cunts. Janice and Amber's hips widen as well but not nearly as much as Gabriel's. He then saw Gabriel's cunts enlarge as Janice and Amber grew more cocks. Gabriel central cunt was taking in three dicks from Janice and two from Amber, the cunts on either side where taking three cocks from Amber and Janice. The nine cocks of Janice that are in Gabriel's pussy, the bottom three were 6 foot horse cocks, the middle cocks are 6 foot demon cocks, and the top are 6 foot dragon cocks.
Janice's cock that is fucking Amber changed to a nine foot horse cock, with only four feet in Amber's cunt. Amber grew large blue butterfly wings from her back. Janice grew more muscular, and she grew 2 more pair of balls, giving her 6, now basketball sized nuts. Gabriel grew more breasts which expanded, giving her 12 MM-cup tits. The three of them grew more arms. with Gabriel getting three arms for each breast plus 4 extra, while Janice grew 14 large arms to grab Gabriel's tits and large broodmother hips with, and Amber grew 10 thin elf arms.
Jeff could barely see Amber under Gabriel's large tits, the only hint that she was there was her wings sticking out and her moans as she played with Gabriel's massive, motherly tits. Jeff saw the nipple of Gabriel's top pair of breasts turn into mouth and the bottom most pair turn into cunts. Jeff used his Chronivac to see Amber grow two more cocks to fuck Gabriel's bottom breasts with. Amber now had 10 cocks and Janice has 11 large cocks. Jeff felt himself close to cumming, but decided to hold it in since he wanted to cum in the three of them.
Jeff gave himself 5 large tentacle dicks, but before he could change his size Janice beat him to it and only made him tall enough for his face to reach her asshole. Jeff then felt his tongue get altered into being a dick. Jeff felt himself become very submissive to Janice, Gabriel, and Amber. Jeff knew that he was still the baby brother in Janice's eyes, so she will never let him become more powerful then her or Gabriel.
Jeff accepted it for now and pressed his face into Janice's muscular ass, fucking her with his dick-tongue. His 5 large tentacle dicks then when into Gabriel's ass and three cunt, and Amber's cunt.
They fucked for 30 minutes, cumming 20 times, before Jeff decided to leave. As he left he returned himself back to normal and saw that his sister's and new sister-in-law were going to fuck for the whole day. Jeff took his leave knowing that they won't be leaving their room for awhile, unless they decide to take their fucking to someplace else for more fun. Jeff went down the hall and saw that reality had changed to fit Janice, Gabriel, and Amber's new size. The hallway was now 26 by 26 feet, making his house very large.