I just submitted Kristen's First Time. This is a direct sequel to It's OK, She's Cool, so you might want to read that one first. This story should still make sense, but it will make more sense if you read them in order.
One of the comments I got on Aaron's Visit was that someone wanted to see Samantha pregnant as well as Mandy. In this story you can get that chance. This is a relatively short, five chapter story. It shouldn't be long between chapters being posted.
Enjoy