Today something odd happened. I had a session with a provider I had seen several times before and we decided to try something different, finishing orally. As I came close I pulled off the rubber and she tried to get me off. I came real close but was unable to pop. For some odd reason I've always had difficulty finishing that way. I covered back up and we went at it again and I came up short again. Usually if I don't pop within the first 20 minutes or so, it doesn't happen. I thought this was one of these times so I focused on getting her off at least once. After she came we took a break and I noticed my balls were extra sensitive. Just brushing them was almost painful. After talking/cuddling for 15-20 minutes we decided to give it another try and I did pop. This did make them feel better after a while. I have never had this happen over such a short period of time. The other two times it was during 4 hour sessions where we had done it in several different positions over a few hours and I never came. I can see how that would cause "blue balls" being so stimulated over several hours, but I didn't know it could happen in an hour. Has something like this happened to anyone else ?  Hopefully sticking to what I know works will help keep the risk of this happening again to a minimum.