Your wife wanted a real man's baby. So she asked your bully to give her a baby. He gave a condition that you gotta watch as he cums inside her. You accepted that happily.
They met 8 months ago and his 8 inch cock has been belching thick loads inside your girlfriend's pussy since. I wouldn't worry though, the baby is yours.
Short fantasies: "Hmm...yes baby. Fuck this hired slut like a porn star and empty your balls deep inside her", said my wife as I rammed my cock hard in the young, hot hooker.