Just reading the title of this tread makes it hard to sit at work
I love trying all kinds of positions, and I make it a point to do so while staying inside of her. If she is on top and is tired, I sit up, wrap one arm around her, and roll her onto her side or her back. It's just such a great feeling.
It can also be fun to take a bit of time and persue different positions in a book or on a website together. Whoo, good times.