I decided to make a joke, but I didn't know my brother had a huge dick...

This situation happened recently, when my parents went to a sanatorium for the weekend... my brother decided to invite his friends over to drink and play Playstation... I didn't like my brother's friends because after meeting them, my brother always came home very drunk. So I just went to my room and locked myself in. I was quietly watching the movie and barely heard the voices of my brother and his friends, but then all three of them came running to me and laughingly started asking, "What size dick do you think your brother has?" Ahahahaha. They were laughing and it made me laugh a little too because they were drunk and making fun of each other... I decided to make a joke too and said: "I think his penis is 6 centimeters at the most". They started laughing even harder and said, "Lol, you don't know your brother well... his dick is 5 times bigger than you said, ahahahahaha"... They left and closed the door behind them and I stayed in the room but I couldn't stop thinking about how big my brother's dick was... I waited for my brother's friends to leave and went down to my brother's room to finally find out everything ... I walked up to my brother and asked: "Is it true what they said?" He didn't say anything back, just pulled down his shorts... I freaked out... it was really huge... I started to get aroused, and at one point the arousal got so intense that I just grabbed his cock and started sucking it... I had never had such a big cock in my little mouth before, but I loved it... Honestly, I would do it again...