u/WizardWild12

I (18yo) was at my best friend's (18yo) house for a sleepover and we were having some beers with his dad (42yo). My friend got tired and went to sleep, but I stayed behind for one more beer. His father is very hot and fit, and I was asking him some gym advices. At some point we started flexing for a bit to show the progress, removed shirts at the beginning to show abs and biceps, then trousers to show legs. He was obviously stronger due to the years, but he noticed that there is one muscle on me that is bigger. He told me that my bulge looks big and I said that we can compare that muscle too. He told me that there is no chance to beat him on that one and I said that if he is so sure, why don't we bet? He said that I am playing with fire. I told him that bigger cock tops tonight. He accepted the bet and we took our underwear off. He was shocked that he lost. He said deal is a deal and we spent the whole night breeding him