It was another day being a horny teen. I wanted to see just how much cock I could get in my mouth. I assumed the position I found easiest to suck myself, by putting my legs against a wall and using it as leverage to bend over. I did the usual sucking my gut in and expelling all of the air out of my lungs and holding it, so I could bend over even further. Doing it this far would I think partially collapse my lung? As whenever I uncurled myself, I could hear this crackling noise coming from my chest. Anyway, there I was, completely curled over with my own cock in my mouth, but this time was different, this time I wanted to push my limits. I arched even further over, putting my member deeper into my mouth. I curled a bit further, and I kept going until my lips were actually touching my pelvis. At last, I had done it. My entire cock was in my own mouth, almost having to deep throat myself. It was a little uncomfortable, and I could only draw short breaths, but I felt achievement. But then I felt a strange sensation in my back.. i ignored it and continued.. until suddenly I felt something shoot out of place in my back and THE most intense bolt of sheer agony shot through my entire body. I’ve never felt such pain before, nor have I since. I quickly uncurled myself, and was in absolute agony. It was lucky that I was home alone, as surely someone would have heard me otherwise. I let out a few tears of pain as the agony subsided. When I sat up on the bed the base of my back was really really soar, where I had felt the sensation of something shooting out of position. The rest of the day is a blur, but I spend it hobbling out of my chair like an old man, being hunched over being the most comfortable position, and trying to hide my symptoms from my parents.