one but not the other

The next few days at school you miss Alyssa but you and Todd fuck like bunnies, apparently sue let him go bare the last few days of her cycle anyway and Todd looks forward to it every month. The days drag on, you barely get to class and when you do you have to be careful not to let his cum drip down your leg because he never seems to want to pull out, your belly always feels like its sloshing but you like the warm feeling of holding his seed inside.

On friday Alyssa comes back to school and runs up and hugs you. You kiss her softly "Where have you been baby?" she nuzzles into your neck "oh you know, I just had a bad period. I guess yours was a little lighter this month if you were here?" You freeze, you haven't had one...