When you need help you don't ask questions!
Several years ago my wife and I were camping with her sister and our brother-in-law.
My wife had her period so it was up to me to take care of things.
The girls were out hiking and I told my brother-in-law that I needed to drop a big load of cum!!
We were inside our camper.
I started to jack off when he came over and asked if he could help out. I didn't care at this point and let him stroke me. It felt so good having someone else do all the work!
When I came it was a very powerful shot across the camper table. After I cleaned up the mess I asked him why he helped and he said that I had the biggest cock he had ever seen and wanted to stroke it and feel its length.
My cock is an honest 8.25 inches long when hard, and 5.7 inches around. His is about 5.5 inches long with a fat head. He had seen me naked before but never totally hard.
We have jacked off together since then, but he has not offered to help again. I wouldn't mind the help!
We are now very open about sex and the four of us take nude showers together and are always nude in my sauna and hot tub!!