I recently bought one of those vacuum penis pumps to add a little spice to my masturbation. I use it responsibly and never overdo it, so I'm not worried about damaging my cock. Anyway, I thought everyone had gone to the fair around the corner from my house, so I got out the pump, lay down on my bed and began my session.
I pumped my dick and then took it out, then pumped it up again and let the pressure out-I did this several times, as it's the best way to enlarge well and safely. I had just pumped it up again, and it was the biggest my dick has ever been. Usually when erect it's about 6 1/2 inches, now it was at least 7 1/2, and extra fat around.
I was just riding the high of seeing my cock so engorged when my bedroom door opened and my 16-year-old sister came in. Neither of us spoke for a while. Finally, she said 'Don't burst anything' and shut the door with a smile. My sister's quite cool with sex and stuff, and she's seen my cock before so it's no biggie, but it was still a shock-what if it had been mum? Anyways, gotta go.