You live above a store in a busy street. This because your mom doesn't like spending too much money. This came in lucky because you have a lot of people to choose from.
First you try something simple, but still weird. There is a teenage boy looking at a pretty busty woman who looks to be in her forties. You thought about the note saying something about awareness, and swapped the woman's left nipple with the boy's mouth, while only the boy could be aware of it. The boy looked pretty weird with a big nipple underneath his nose. But didn't find out until he entered a store, so you couldn't see his reaction. The woman had also left the scene.
Now you wanted a good reaction. You saw a little girl playing with her older sister and swapped the sister's face with the girl's asshole, while only sister would be aware of it. You then heard some screams from the little girl's skirt while the sister's body was panicking and feeling the new asshole on her face. The little girl was asking what's wrong and for her sister to stop feeling her asshole.
'That's interesting, did I make them keep control over their parts?' You thought. This needs another experiment.
You saw a boy about to slap his little sister. You had the perfect test subject. Seeing that you needed to take a leak, you swapped your pussy for the boy's penis, while concentrating on you keeping control and the boy not being aware. You felt your new penis, but couldn't feel any sensation from it. You then tried to pee. To your surprise, the boy's pants looked like they were getting wet and the boy was panicking. After your leak, you swapped back. This will be interesting...