One male view
This is one perspective from the other side.I don't claim to be an expert but I am in my early forties so my experience could be relevant .
Is he fit and healthy? I recall when I was overweight, I used to run out of breath quickly and was exhausted after a few minutes of thrusting. This inevitably cause the erection to go. Once I became fitter, and lost a lot of weight, my stamina improved and found that I did not have to stop to catch my breath, and restart.. I could bring myself to come without a pause.
Secondly, I wonder whether he is getting enough stimulation from the penetration inside you. I have found that with some women, whose vaginas are relatively large and relaxed after childbirth (instead of tight and firm) the penile stimulation may not be optimal. So when I was younger, I found there was a difference in my performance with different women according to the amount of penile stimulation I was getting. One solution would be stimulate him a lot BEFORE penetration.
Not sure the above is at all relevant in your situation, but thought it might provide you with some insight.
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