Yeah it was a surprise, probably would have been more of a surprise if I had not been a bit drunk at the time. I was visiting my mother for the weekend and she set up a quick party to celebrate the visit. Nothing big, it was just a few of her friends who knew me and a few of my friends, including my current girlfriend who drove in from the college for the party.
I had slipped upstairs to go to the bathroom and since it was the small bathroom directly off my room I didn't bother to completely close and lock the door before I started. Anyway, I had a lot beer to drink so I was only about half way finished when I heard the door creak behind me. Figuring it was my girlfriend sneaking in, I didn't turn or try to stop, I just continued.
It was only when I heard, "You're getting it all over the rim, just like when you were little," and suddenly my mother squatted down beside the toilet. "Here let me show you," she continued, grabbing my cock from my hand and aiming it for me.
"Mother..."
"Now don't interrupt me. You used to pee all over the place when you were younger. See how easy it is," she said, aiming my cock so the stream lightly glanced off the porcelain before trickling into the water. "So much less splashing."
As the last of the stream trickled into the water, she reached over and grabbed a bit of toilet paper and dabbed the last droplets of urine from the tip of my cock. Dropping the toilet paper into the water, she reached up flushed the toilet and said, "And if you bothered to wipe like us girls we wouldn't have to continually clean up those yellow stains from the floor."