When you're giving it to her doggy style and she's almost there. You bend over, wrap your arms around her and grab a breast in each hand. Then you whisper in her ear "damn girl, your pussy's fabulous. Almost as great as {Her best friend/sister/mother's name}. Squeeze tight and try to hold on for 8 seconds! Yeehaw!
Dude. I gave Cara the old Alberta bronck Buster last night. Only made it 5 seconds...