Cumming while pleasing the misses

I have a long history of having orgasms from pleasing my wife. When we were younger and dating I was able to finger her to orgasm quite regularly on the couch, in the car, wherever/whenever, and I always went home from our dates with cum in my pants. Years later I still have little control over my orgasms, and I have cum several times in my cage and/or panties while performing oral, working her favorite dildo, etc.
 
I've done it the last 3 times. Not sure how.

It might happen to me 2 or 3 times in a row, and then nothing for weeks. I assume it's a factor of how aroused you are, combined with how "drained" you were the previous times.

Mrs Edge used to worry that allowing them would make me lose motivation, but it really doesn't happen. I think it's because they aren't as physically draining as a full-on orgasm.
 
One of my favorite ways, for me, when I give my wife pleasure orally, and to hear and feel her joys gets me so excited that I can very easily cum with no touch or rub. I often have to cool down for a minute or two before PIV so that I can hold out.