I live in a balloon

Well, sometimes it feels like I live in a balloon. Our house certainly seems to expand and contract like a balloon. A month ago, this house was bursting at the seams with people short and tall. Now, everyone but our last chick has gone home again and she's off for the weekend bidding friends from her old college a last farewell before her upcoming 1,200 mile drive to her new university. So, our balloon house has emptied again, and now it's just the OC and me here listening to the crickets chirping outside while we prepare the SS lessons we'll each be teaching tomorrow. Well, he is preparing, I have been procrastinating...until now that is...