John was horrified at what he saw. Another penis was going into him, a man. He was equally horrified by how he felt, which was good....very good. He never felt anything this good when he did his wife doggystyle. Sure, he had a great orgasm at the end when he took his wife, but being full of cock felt amazing.
Then the pumping started, slowly at first then got faster and faster. Each thrust sent another surge of pleasure through his body and another pulse of dopamine through his brain. After a minute his final bit of resistance failed with his brain craved what his pussy did, a big dick having its way with him. So much so, John was slamming his pussy into Julie's shaft even without her hands guiding him. Julie just stood there as her friend's dad was doing all the work for a moment, grunting and moaning in front of her. Then, she grabbed John's arms and pulled them back, pulling John to a more standing position. He curled his toes as his first female orgasm ripped through him, causing him to scream as his eyes rolled back. His legs almost gave out. John felt his pussy get even more stimulation as Julie pulled his arms to pull his wet slit onto that massive rod with more force.
"Feels good to be fucked in your pussy, huh John?" asked Julie. John nodded weakly. Julie slowed down, "I need to hear you say it. Say you like being taken or I'll stop."
"I like....being..taken," murmur John while he picked up the tempo by thrusting himself onto the dick behind him more quickly.
"That's right, your my slut. You crave this. You..oops," said Julie as she emptied into John's willing womb. John felt himself fill up with cum, leading to the best orgasm of his life. While his brain was a fog of pleasure, relaxation and contentment. That is until he heard a voice say, "Dad?!"