One month later

I said on the edge of the bed again. Monica's naked body kneeling in front of me. She crawled between my legs as she had done many times. I was already rock-hard as she had trained me to be.

She looked up at me, her mischievous eyes and smile causing me to shiver. "Remember, if you can last 30 seconds you can fuck me however you want. My bad but oh-so-talented mouth, my big round tits, or even my perfect little virgin butthole. I know how badly you want to get in my wet pink pussy. But if you cum before 30 seconds is over, I'll be really proud of you. And that's the biggest pleasure of them all isn't it?"

I never lasted long enough and she had been reducing the time gradually since the start.

Monica dove in, her soft mouth enveloping my dick. I knew I wasn't gonna make it this time either.