I was just gone for a second to buy more beer, but when I came back my girlfriend was on her knees sucking my dad's huge cock. They didn't see me come in, which let me spy on them while they finished.

"You're so fucking big..." she told him, trying to be quiet.

"Just hurry up before my son gets back," he said, but both of them were clearly taking their time.

My girlfriend was moaning while she sucked and licked. I had never seen her this excited on her knees before, and I'm not gonna lie, it got me a little excited too. Meanwhile, dad was dirty talking and breathing heavily. He held on to her hair tightly, occasionally pulling her head back so she could breathe.

In the end, he shot a fat load in her mouth. Some of it spilled out of her and the rest she swallowed. After they were clothed, I gave them a moment to relax before coming inside. First thing my girl did was give me a big kiss in the mouth that definitely tasted funny.

To be honest, I kind of liked the taste and hope I get another chance to see them again.