How big did you brother end up growing to and do you have any more stories about him shaming you and fucking girls way too hot for you?
My brother is now 9.5 inches.
Here is another story: one day we were at the gym, him completely shirtless, showing off his incredibly well muscled body and me trying to conceal my weak shape. Then this incredibly hot girl Cindy, from my class walked up to him and they started flirting. He grabbed her ass and her boobs and she reached down his shorts and gasped at his size. Then they went to the bathroom and had sex for about 30 minutes.
About a week later she came over when our parents were away. She knew that i was his older brother. She said that she couldn’t believe how big the gap between us was. He laughed and said “Yeah, why don’t we find out just how big it is.” She agreed and i had no chance denying both of them. So first we measured heights and found that he had grown to 6'3.5" and i was still 5'3". Then we took off our shirts to compare our bodies. He was (of course) incredibly muscular and looked like a god. I was (and I am) a skinny and weak nerd who looked like a 13 year old. Finally, the most important test of penis size. Cidy let us grab her boobs to get us hard and then she measured. I came out at a whopping 2.1 inches, while he had grown even larger to 9 inches even. She said “Oh my god” when she saw his and she stripped down and they had sex right in front of me. It was incredible, her huge boobs bounced like crazy and her ass was so perfect riding on his big dick