I can't go for a "round 2"

I can't do it! Whenever I spend the night with my partner we sometimes try having sex the morning after we had sex. So we have sex at night then try for a round 2 when we wake up. But it hurts me sooooo bad in the mornings. The sex the night before is perfect, nothing hurts, but as soon as he starts getting a rhythm going in the morning, my vagina feels swollen, mild burning sensation. I've had yeast infections before but I know I don't have one currently. I get the feeling every time he wants to go again. It sucks :(