Sucking a customer's dog

Working at a customer's house a few months ago, doing domestic renovation work. Lady owner was on work calls upstairs. She's got a lively cross breed greyhound and something else mix. He's about 8 years old. I had chance to play with her male dog while she was upstairs on a conference call with work. I stroked his back and neck and then reached down to his cock and started stroking his cock. Pretty quickly I could feel him getting harder. I ducked underneath him and began licking the red end of his cock. Less than a minute his cock suddenly pushed out of the sheath. He had a really meaty cock. Over an inch thick and about 7" inches long. Twice he pulled back from my mouth but I guided him back in. Suddenly he started frantically fucking my mouth. I sucked him as firmly as I could. I pushed a finger into his asshole and he exploded into my mouth. He pulled back and spunked over my lips, cheeks, chin, hands and my cock that I'd just pulled out. Then he very kindly licked my cock.

Before I could cum I heard the footsteps of his owner coming down the stairs.