Step 1. Get your boyfriend in a position it's hard to get out of. Step 2. Put his cock in your pussy. Step 3. Brag about how many guys you're cheating with while he tries to squirm away.
Your long distance girlfriend made a new friend at work. As soon as he heard you were miles away, he knew he just needed to be persistent. How would you even know she spent the night at his place?
He has bigger muscles, bigger balls, and a bigger cock than your boyfriend. The tingles you feel right now are Mother Nature instructing your body what it needs.