You may want to try adjusting your timing and your technique. They can then go on to last longer during intercourse. This may make it last longer. Of course you may also be too tired for this. In which case, I suggest trying oral sex in the morning after you two have had a good night's sleep.
People tend to have more endurance first thing in the morning because they are well rested.
And it's a good way to get energized for the rest of the day. You may also want to adjust your technique. Try starting out slowly and building up. Using your fingers, you can also form a tight ring around the base of his penis. Some men say this makes them last longer.