Derick had a few issues walking out of the bathroom at first; his G cup breasts were unsupported since he lacked a bra, while his wide hips made his plump ass sway with every step. Add his newfound dainty feet wearing sandals with slight heels leads to a disastrous trip waiting to happen. "If I can just get my original parts back into Jennifer's locker, no one would be the wiser." Derick planned; now speaking with Marissa's voice. He still finds it odd at how comfortable he is being a biological female right now; maybe he's had some deep rooted fantasies he was unaware of that were now fulfilled. Whatever the case, Derick relished these new feminine sensations and planned on keeping them for himself, at the expense of whoever originally owned these parts stuck to his body.
Thankfully, gym class for the girls was still going on, so Derick met no resistance upon sneaking back into the locker room. Even when he finally got back to Jennifer's locker. "Ok, this is gonna be quick." He said, picking the lock again and opening the locker. Once the door was opened, however, a pile of body parts fell out onto Derick. "Gaaah!" He screamed with his female voice, not sure if it was loud enough to be heard. "W-what the hell...." He wondered, looking at what is evident of the beginnings of a serial psychopath. There was a head without a mouth, a torso, arms, hands, legs, and a lower torso without any genitals. The missing parts from the pile was something Derick noted right away; "No mouth, breasts, ass, feet, or pussy. That must mean this is who originally owned my new parts!" He concluded, picking up the head that didn't make any movement or expressions.
What Derick didn't know is that Jennifer had gotten pissed at Marissa during gym class again and ultimately took her apart before stuffing her back in her locker. "Jennifer must be crazy. I gotta finish up here and get away!" But, Derick also stopped to think; he was enjoying having female parts, but what about an entirely female body? Deciding this was something he wanted, Derick repeated the process from earlier, including stripping down entirely. His nipples quivered from the cool air brush past them, and his pussy tightened up at him expecting the end results. As he had thought, it actually worked; the huge pile of Marissa's body parts swirled around him like a tornado, making his parts detach, so that they could replace them It ended sooner than it began, and Derick found himself a full woman now. "Oh my god..." She moaned, looking at her smooth hands and running them up and down her new curvy body.
Derick quickly scooped up her old parts and shoved them all into Jen's absurdly spacious locker, then close it up; but after nabbing the grey sports bra and yoga pants from it to wear over her voluptuous bod. "Ah man, this is so damn awesome!" Derick said, leaving the locker room while rubbing her pussy through her yoga pants. 10 minutes later, Jennifer finished up her class and went back to her locker, taking time to laugh at the pile of a person inside. "How'd you like being in the dark, Marissa?" She asked the pile of parts that once was Derick's body. "This is what you deserve anyways, bitch." She cursed, closing the door; fully thinking that Derick's body was actually Marissa's for some reason.