Well first thing first James would make a small change to Anthony and make him an extremely deep sleeper. Nothing should wake him outside of feeling fully rested... Which shouldn't happen for another 7 or so hours. Now then... James first tested out this sleeping thing. He flopped onto his bed noisily, then took off the blanket off the monitor... and no stirring. James was curious about poking Anthony, but wasn't curious enough to touch the guy in his bed. Sure the bed was actually clean, and Anthony just showered but he wasn't that comfortable poking him like that. Instead James went to the Chronivac and put in the change as flipping Anthony's gender. Seeing as how Anthony was so splayed out... I mean James had already seen the female form in himself when she was a herself, but it was different when it was someone else. Body hair withdrew as Anthony's body became more dainty, but the parts that James cared about was the now smooth chest of Anthony ballooning as the nipples started tenting out the simple tank top. Although the boxers made it harder to see Anthony had a nice booty as well. Anthony twisted in her dreams a bit and started to rub her breasts trying to get them in a more comfortable position. The tank top probably irritating the more sensitive nipples.
James went back to the chronivac to the "reality alter" section and hit "clothing adjust". The tank top changed to another simple top held on her shoulders by little more than strings and were a little more comfortable for her breasts, but the part that James was looking at was Anthony's boxers which shrank and became more of a firm fit showing off all the roundness and curves of Anthony's lower body. James slowly approached Anthony's new older female form. There was no way he'd make enough noise to wake his parents up a few rooms away, and nothing would be waking Anthony up. However there was something about sneaking a peek of an older woman while she was asleep that felt... sneak worthy. For a good few minutes James watched Anthony as he hear her slowly breathing in and out. Watching as her C-cup breasts lifted upwards as she inhaled, and sank back down as she exhaled.
James grew a pair as he decided to go in and gave Anthony's boob a firm squeeze. It for sure felt like a boob, but he wasn't expecting Anthony to give out a moan that turned into a little squirming as James realized his squeeze was probably a little too firm. James then did some experimenting with the older girl. Giving a poke to her soft cheeks, feeling the firmness of her ass, getting a general feel of a girl as a guy, and then looking at some of the more private areas. James lifted the simple top and got a look at Anthony's nipples, and gave them a swift flick to hear Anthony groan a little and watch the nipple harden. Anthony being a restless sleeper however took this time to turn and grab James as both fell out of bed. Now on the ground with a mature woman on top of him James was freaking out a little bit happy this woman didn't wake up and feel his raging boner. After a few minutes James got his composure and got Anthony off of him... and then wondered about how strong he really was. A small effort later and James was able to get his older sister back into her bed.
His heart racing James lay in bed staring at the older sister in the other bed thinking about what he'd do now...