I was out running with a guy whom I’ve run with dozens of times, always very platonic. On this occasion we were about 10 miles in to our run on some remote trails; we hadn’t seen another person the entire time and were enjoying the weather and solitude of being out on the trails.

All of a sudden he pulled up, yelling and grabbing at his hamstring. He dropped to the ground and told me through gasps that he was having a really bad cramp. I sat down quickly beside him and helped him straighten his leg and started rubbing out the cramp. He had leaned back a bit, resting his weight on his hands, and I worked on the cramp.

I guess during the process my hand had drifted and I realized it was pretty high up on his inner thigh. He still had his eyes shut and didn’t seem to care. I also noticed a bit of a bulge had formed in his running shorts. I was fixated on it for some reason, and kept working the cramp with my right hand while staring directly at the bulge that kept slowly growing. My left hand had a mind of its own and kept slowly sliding up until it was just below his crotch, resting lightly on his inner thigh.

The cramp seemed to have eased off but he now had a huge erection; it looked much bigger than my husband’s. He finally realized what was happening in his shorts and stammered out an apology. I told him not to worry, that I was flattered I had that effect on him. I then did something totally out of character and unexpected, I reached up and pulled his running shorts down to free his cock.

It was thick, and at least 8 inches long. I stared at it for a second and then told him how magnificent it was. I then reached out and grabbed it with my right hand, barely. It was so thick my fingers almost didn’t touch.

We were both sweaty, and his cock was slick with perspiration and pre-cum. I started working my hand up and down the length of his massive cock and cupped his balls with my left hand. It didn’t take long till I felt him tense up and his cock began to throb in my hand and he started shooting jets of warm cum up into the air to land on his legs, my hand, and even a little on my face. I pumped his cock until he stopped cumming and then put his shorts back in place.

We sat silently for a few minutes, staring at each other and not speaking. Finally I told him I wasn’t sure what came over me, but that after seeing his cock I wasn’t going to be satisfied until he fucked me. I stood up and dropped my running shorts around my ankles. My pussy was drenched.

I moved over to a nearby tree and used it as support to bend over, offering my exposed pussy for him to see. I heard him get up off the ground and move behind me. I looked back and watched as he dropped his shorts and, impossibly, his cock was rock hard again. He grabbed the base of it with one hand and used the other to play with my lips. He rubbed the head of his cock against me and then slowly slid it in. I was in heaven. I told him to fuck me hard and he did. I come fairly quickly and this was no exception.

I felt an orgasm building and nearly collapsed from it. I’d never felt so full! He didn’t stop and I felt another one begin to build. This one was even better than the first and I cried out. I told him I wanted him to cum in me and that I was on birth control and he pounded me for all he was worth. I felt him tense again and then grunt as he exploded in my. I could feel the warmth of his hot cum filling me up.

When he pulled out there was a sucking sound, it sounded like my pussy didn’t want to let go of his cock. I huge glob of cum fell to the ground and I almost collapsed. We recovered and finished the run, still without seeing anyone.

I have a hard time fucking my husband now after that and I can’t wait until the next solo run with this guy.