Now possessing roughly 95% of his sister’s body, the idea of completing the whole swap began to circulate in Mark’s mind. Sure, it was kind of funny to think he was a mix of both himself and Carly but something was telling Mark to go further and swap completely with her. This urge became too much to ignore as Mark began to look around for items that would swap them completely.
Mark’s groin area was an easy swap as he understood that finding a pair of Carly’s underwear would swap that. The head part was the more tricky part as Mark wondered if one item could swap everything or not. Mark scanned the closet that he was still near and didn’t see anything that could help him. Moving over to Carly’s dresser, Mark found a headband along with a pair of sunglasses.
“This has to work,” he thought to himself as he then went into her drawers to find a pair of underwear. Fishing around, Mark eventually located a drawer full of her underwear and pulled out the first pair he spotted. With all three items, Mark was eager to continue swapping with Carly. He double checked to ensure she was still asleep before kicking off the last couple swaps.
Mark began by slipping his boxers off and slipping on his sister’s pink underwear. The underwear itself went on easy as Mark had Carly’s smaller body. What was a bit of an issue was the fact that Mark’s cock could barely fit inside of Carly’s underwear, an issue that quickly became irrelevant as the swap kicked in.
Rapidly, Mark’s cock began to shrink as everything began to pull into Mark’s body. Once completely gone, his cock shifted around and slowly began to convert into a female reproductive system. Mark’s organs shifted along with his crotch splitting in two. Along with this came the loss of Mark’s pubic hair and his ass. Both were minor compared to Mark losing his cock but once complete, Mark now possessed Carly’s groin area.
Feeling that swap come to an end, Mark wanted to keep the ball rolling as he placed the hair band on his head for the next swap. Mark hoped that this would swap his entire head but it appeared to only swap their hair. Mark’s brown buzz cut grew longer and lighter as it shifted into a blonde ponytail. Mark was a bit disappointed but then slipped on Carly’s sunglasses which swapped the rest of their faces.
Mark’s eyes shifted in color from blue to green as his features grew softer and smaller. His facial hair rapidly began to disappear along with his eyebrows becoming thinner. Mark’s lips grew a bit thicker as he also seemed to gain Carly’s crooked teeth. After a couple more seconds, Mark now possessed his sister’s body from the head down.
“This is crazy,” Mark whispered as he noticed he still had his male voice. It was weird to hear it with the body he currently had as Mark searched on top of the dresser for something that could fix this. Eventually, he located a necklace which he quickly slipped on. This swap lasted a second or two as Mark felt his neck tingle.
“Check, check, is this thing on?” Mark whispered as his voice was now much higher and an exact match to his sister’s. “Holy shit, it worked.”
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