You and Karen check on Bobby and Amber-You were right

You make a lot of noise so they are covered up when you and Karen see them.

"You were wrong." the girls say to each other at the same time.

Karen and Amber then defend their respective guys. After a truce of sorts everyone goes to sleep for a while. You try to read minds the next day but can't. It was either short lived potion or a type of hallucination. Bobby's rubber covered cock breaks Amber's cherry the next afternoon. They have safe sex on a near continuous basis. Sometime over Christmas break a condom breaks and changes things for the couple. They marry but then divorce two years later.

You and Karen make it to Spring break before she gets knocked up. You both got too drunk and neither thought of a rubber. You and Karen don't get married until after you both graduate college. You both go to the local community college. You have three kids before you get married and two more (twins) after.