Grandma's Misunderstanding

Boy: "I can't get it up ..."
Girl: "Sure you can. Push!"

Boy:"Grab it undereath!"
Girl: "Oh. Wow!"

Girl: "It's so big. I love it!"

Girl: "Give me the balls now."
Girl: "Oh, these are just beautiful!"

Boy: "Boy, I'm exhausted!"
Girl: "Yeah! I'm glad we only do this once a year."

Grandma crashes!

Boy & Girl: "What was that?"