We are the same, my wife loves how quick I cum (good for her ego as well I guess) plus because of it we use condoms (or the little bag of shame as she calls it) almost 100% of the time, so if its over in a few seconds, there is no hassle with having to clean her pussy (so for me that also means there is a higher chance of sex then) so we just enjoy it for what it is, plus she doesn't get any actual sexual pleasure from it so she gets pleasure from the amusement and fun of it all.
About 5 years ago, she bought a 3 minute egg timer, and we agreed any time I could go past the 3 minutes, I could take the condom off but I had to fuck as hard as I could, no stopping and starting.
In 5 years, it still hasn't happened, but she has got better at it, on the very rare ocassion I get to the 2 minute mark, she'll start to whisper slutty things in my ear, suck my nipples, put a finger in my ass etc. and she knows i'll cum instantly of her doing that.