Looking at the face of your big brother sleeping and squeezing your young crotch, you come up with an idea. You could permanently become Lucas and then possess Matthew. A smile appears on your face. "That would be so wrong. Which makes it so good!" You close your eyes, clear your mind, so that you only feel your body. As everything starts to go black, you hold your breath. Lucas' body falls onto the ground with a smack. The sound woke Matthew. He looks around confused, but doesn't see anything strange, so he turns around in his bed and goes back to sleep. A few seconds later, a bright light shines in yours eyes as you slowly open them. The sun is shining through the window next to you. You quietly stand up. "I'm still Lucas... Did it work?" you whisper to yourself. Matthew, who is trying to sleep in again, start to turn around into your direction. The sudden movement in the bed surprises you and as you take a step back, you trip over something on the ground. "Ahhh!" you gasp loudly. Matthew now sits up straight in his bed, looking in your direction. You hold your breath as he looks you straight into the eye. Your, wide open, eyes are locked onto his. The stare-down never seems to end. Then Matthew lays down again and turns his back to you again. "What the actual fuck was that?" you think to yourself. You only notice something's off, as you try to sneak over to your brother again. "Holy shit, I'm floating!" You look at your semi-transparent hands and move them through the beam of light coming through the window. You immediately fly over to the bathroom to look into the mirror. Your mouth drops in happiness as you see a ghostly version of Lucas smiling back at you. "It worked! I AM Lucas!" With a big grin on your mouth, you fly back the your big brother's room.
You float next to your brother, who still has his back turned to you. You scream: "Here I come Big Bro!" and launch yourself straight into Matthew's back. His body quickly absorbs your ghostly form and makes a jump on the bed. "What the..." Matthew says as his body falls back onto the bed. "Arghhhh!" he starts to groan. He can feel you inside of him and tries to push you out. He jumps out of his bed, but falls onto his knees. Matthew grabs his chest, as this is where he feels you the most concentrated. He desperately looks at it, knowing there is nothing he can do about it. Your mind pushes his away, bit by bit. Matthew rolls onto his back and can only stare at the ceiling of the room. His mind slowly fades away as yours is taking control. His body makes another jump and drops back unconscious.
A few seconds later you open your eyes. Light shines through the window into your eyes. Confused you look around the room. As you sit up straight, you look at your new, big and strong hands. You are now in control of your big brother, Matthew. You feel your new body up and grab your large, new crotch. "Hmmm..." A wave of pleasure rolls down your spine. Matthew's memories and personality starts to mix with yours. "Hell Yeah." you say in your new voice. You run downstairs, into the bathroom. As you look into the mirror, you are greeted by a familiar face, Matthew's, which is now your's. A dirty smile appears as you guide your hand over your new face.
"Perfect." you say.