You go into your brothers room.....wait you mean Brandons and see a workout bench,dirty laundry, and posters of very hot girls. When you find his closet it has only a few shirts.
They are all athletic getup like Nike and Under Armour. You choose a red shirt and take off Brandons shirt. When you put it on noting happens other than being really long and going farther then your kid ankles and then you realize maybe you have to put clothes of him on your body completely.
You then go to his dresser and take out some boxers and shorts. You take off your childs pant and underoos and put on the boxers. The boxers are extremly huge and could be mistaken for pants. You finally put on the short and then you get a instant rush.
You feel your body changing as you began to morph into Brandons older brother. First you begin to get taller maybe about 6' 6". Then your frame begins to get more muscular as two pecs form and a six pack. You then feel your legs getting more developed as well as your arms. You walk to the mirror you look like a prebuescent older brother when you begin to go through puberty.
You start to grow hair on your arms,legs,lip,stomach and your DICK!!! You pull down the boxers to see a huge dick maybe 7 inches covered with pubes. You feel your voicebox change from a little kids to a deep one. You feel acne forming but then dwindling away as your host had already popped them. Then your body becomes more developed and then you pass out.
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When you wake up you remember what happen and run to the bathroom. You see a older brother who is popular and very athletic....wait that's now you!!!! You flex a bicep and then feel something in your short its a student id. It says your new name is Matt short from Matthew. You then decide to get ready and as you walk to your new room you pass Brandon in the hallway. You could get used to being a older athletic brother.....