Lasting pleasure

My husband doesn’t last long, it’s usually like 10-15 minutes and he’s already cumming. I can finish that fast if I’m in the right phase of ovulation but I don’t want to. I want to make it last and build the pleasure up. I have told him this and about edging during sex but he gets too impatient. We’ve had some great sessions that were upwards of 40 minutes but I don’t know why he can last those times and not others.

He says I’m so sexy he just gets too close. Any tips how to draw out the session without him getting impatient and taking over and finishing?