Hanging around at the benches at the edge of the park you spot a group of boys your age. You decide to take a close look to see if there's anything you like about them. You find yourself a way through all the people and watch them from a distance. You move a little closer, but just not close enough to make yourself suspicious. The boys have their bikes parked against some trees next to the benches. Some of them are sitting and others are standing. Since it's summer, they're not wearing that many clothes, which makes it harder for you to possess one of them without being noticed.
Suddenly one of the boys walks away from the group and grabs his phone. "Free body, right there." You leave your little brother through his ass and slither out of his pants into the green grass. Being green yourself, you can easily move to your target without having to worry about being seen. As you get closer to the boy, you can hear him talking on the phone. Even though you can't literally understand what is being said, you are pretty sure he's being told to come home. "Perfect. That would save me having to deal with the rest of the group." You slither to in between his legs. "Alright. See you in a bit." the boy says. You quickly climb up his legs and into his pants, which have just become a lot heavier. "What the..." the boy says while looking at his pants. You're not gonna wait for him to find out what's going on and docs straight into his ass. "Ungggg...." the boy groans. He keeps himself quiet, because he doesn't want his friends to see him like this. And because his tight ass is holding you back, you decide to split yourself up and force the rest of you in through the boy's dick. "Ahhh...." He softly groans, closing his eyes in pain.
As the last of your slime enters his body, he starts to lose his balance. You correct him as much as you can with the control you have of his feet. When you're finally in complete control of your new body, you take a good look at yourself. Even though you can't see your new face, the rest of your body looks good. You put away your phone and access the boy's memories. His name, now your name, is Anthony. He's 18 years old, which makes him a year older than you are. Now that you know a little more about your new self, you decide to walk up to the group. "Guys, I just got a phone, gotta go." you say, trying to make it sound the way Anthony would've said it. "K then, cya later." One of the boys says. "Bye." You walk over to Anthony's bike, sit down on it and ride away. When accessing Anthony's memories, you learned that the phone call he just got was from his younger brother, calling him to ask Anthony if he could open the front door for him as he left his own keys inside.
A little later you arrive at your new home. You see Anthony's brother standing in frobt of the door. "Hi bro. Thanks for coming." he says to you. "Sure." you reply and open the door. "Thanks" he says, and walks inside. You leave your bike against the wall and enter the house.