It reminded me of the course I had to run regularly in the Marines.Petra explained what was to happen as we walked to the beginning of the course, “...k, for a baseline, I want you to run the course without using your mana.” She pointed to a couple of hourglasses embedded in posts, “When I say go, I’ll turn the first glass and start your time. We will use the others for your other runs.”I cleared my M4 before handing it off to Petra, then I began to stretch and get my blood pumping. Once I was. The touch of the loofa as I ran it over my bald privates was like an electric shock, focusing my erotic thoughts. I opened my eyes briefly and looked around... still alone... and I did it again, causing a soft moan to escape my lips. I closed my eyes again, and dropping the loofa, I caressed my slippery slit, running one finger slowly in between the lips before I slowly inserted it deep into myself. I was so wet and hot... I took my finger out and sucked on it, tasting myself, and realized that. What would he do?Walking up through the dunes to my back door, I could not feel him following me. Darn.....There is an outdoor shower at my little beachside shack which isn't really visible from the beach. I had a quick rinse, dried myself off a little bit and went inside.The experience was a bit of a turn on, just seeing a hot older guy wearing a speedo isn't that common here in Australia. I figured I'd grab a beer, grab my laptop and sit on my back deck to dry off and I'd already decided. It only took me a couple of minutes before I felt the build up inside of me.I grabbed Sara’s head and moved it up and down, the held her still as I used my hips to thrust up in to her mouth.As I let out a loud groan, I let the fluids flow from my cock in to my sisters waiting mouth.When I finally lowered my hips back to the bed, Sara sucked and stroked me a few more times, taking in any remaining cum let inside.“That tasted better than I remember little bro” she commented.“Thanks. I wasn’t.