It didn't hit you right away, but after a few mibutes you finally realized that something big was up. This wasn't your room, but Lauren's. You had just gone into Lauren's room and thought it was yours like it was unquestionably true. "Woah, that's a bit freaky" you said to yourself, although now in Lauren's voice since you swapped voices with her when you took her neck and mouth.
Perhapse you may have taken this a bit too far. But on the other hand, did it really matter? All of her clothes were your clothes now, and it wasn't like you disliked her room's design. Sure it was a bit more girly here and there, such as with all of the soft fluffy hair on literally everything, even the lamp shades. But there wasn't anything you couldn't handle. Plus, her room had always been bigger than yours, under the pretext of her being a girl and needing more space. Hiwever, now you were the girl, so logically, all of this extra space, was now meant for you.
There were only 2 things still wrong which needed immediate fixing. The first, was your head. As long as you left her brain, you figured that giving yourself the rest of her head would be fine. The second thing, was you wanted some unique difference. Something kinky, or crazy, that split you away from the norm. But what?
You figured you would come to an answer later, so you just went outside one more time to finish your now full body swap. Surprisingly, it was pretty easy to do. No pain, no issues, nothing. Just you now fully inside of your sister's body from head to toe and vice versa.
Your new long straight hair, which used to be tied in a ponytail, had just been undone by you and now loosly fell down your back. Your bangs naturally pushed to your left side and to your slight annoyance, wouldn't stop falling down infront of your left eye. But you felt that you just would have to get used to it, as it made you look hot. Right as you were about to leave again, you had an epiphany. The answer to your second issue lay sunbathing right in front of you.
You quickly detach your old cock from your sister and stick it right on your tailbone, balls hanging down. It was weirdly comfortable. And with a bit of practice, you found that you could control it easily. And that it was "permanently erect" because it was actually an extension of your spine now. You had a literal cocktail, with balls. It did surprise you when you began to grow horny and it lengthemed by 5 feet, and became more flexible, but you got use to it quick enough. Lastly, cumming out of your cocktail was way more pleasurable that your old boring setup, but still not even comparable to cumming with your pussy. Still though, you were happy with it, and glad that your clothes had become fixed to accommodate for it. Interestingly, your panties were now adhesive and just covered your front. It made sense to you though. Your tail covered for your asshole, and it also made traditional panties hard, to nearly impossible to wear correctly. Now with your body complete, you stuck your new cocktail into your own pussy and began fucking yourself for the next several hours, happy that you almost certainly couldn't impregnate yourself.