“Matty gets plenty of cardio.”

“Different kind of cardio." Sam smirked.

“But hopefully your recent spike in training has helped your endurance. You're already dressed fine. Just grab your running shoes and let's go."

I blinked.

“Wait, we're seriously going running? Each of you girls gets one-on-one time with me this weekend and your choice is to go running?"

“What? I always go running on Sunday mornings. Worried you can't keep up?" Her expression was smug and there was a challenge in her voice.

"Uh, no, I'm pretty sure I'll crush it."

Sam grinned. "We'll see about that."

Our suburban neighborhood had put an emphasis on green space during development which resulted in some pretty good trails - both dirt for running and asphalt for biking - that wound around parks, alongside creeks, and between different housing tracts. Sam got me to chug a glass of water before we got going while I complained, “Aren't people supposed to wait an hour after eating before exercise?"

“You'll be fine. Stop whining," she scolded Like a parent.

After pausing to give Belle and Mari quick pecks, I obediently followed

Sam out the front door, and together we walked at a brisk pace over to the nearest trail we could access two short blocks away. I knew from past experience that it ran for half a mile between our housing tract and the neighboring one, and then connected to an asphalt trail that followed the creek before hitting a big city park with a lake in the middle. If we made it all the way to the lake, went around the Lake, and came back, it would be about five miles, most of that on dirt trail.

Sam was silent, wearing her “game face”. Like I said, she was a driven young woman, and when she set her mind to something, nothing would get in her way. I didn't feel particularly competitive but understood that my role this morning was to keep up with her. And hey, maybe she was planning to find some quiet place behind some bushes and get my

“outdoor” cherry or perhaps a blowjob just like in Tahoe (without me freezing my balls off). Although nervous at the idea of getting caught,

I wasn't so nervous as to seriously consider turning her down.

So with that in mind, once Sam started up I simply followed her pace and ran alongside her.

Running between the two housing tracts, we had the place to ourselves and were able to run side-by-side. But once we hit the creek, there was significantly more two-way traffic from both bicyclists and other runners. I wound up tucking in right behind Sam, which turned out to be quite an improvement from my point of view.

People considered these trails to be fairly scenic. There was a lot of grass between the housing tracts, following the creek offered a glimpse of nature, and the park and its lake with ducks and geese were even more picturesque. But none of them could compare to the sight of Sam's ass squished into skintight spandex.

I found myself calling up memories of the good times I'd had with that

“arse”. I remembered fondling the globes while she sat in my lap, dry humping herself against my erection out on Matty's Chair. I remembered the sight of her wet body bent over in front of me beneath the spray the first time we had shower sex. I remembered the sight of her anus gaping wide open and not closing back up after I'd just finished slamming my dick through her backdoor over and over again.

It occurred to me that I hadn't sodomized that ass in a long time now, since the little orgy at the end of winter break. Not that I had much to complain about having violated Naimh's crinkled butthole nearly every chance we could get, and Mari‘'s twice in the past few hours. But that just gave me incentive to keep up with Sam and fantasize about revisiting that beautiful bubble butt soon. Maybe even out here behind some bushes.

It turned out that I needed the incentive. Fucking as often as I did had certainly improved my cardiovascular health, but it didn't help quite so much with my leg muscle endurance. By the time we got to the lake my feet were starting to feel Like lead weights, and even though we now had enough room for me to run alongside her, I found myself unable to actually keep up.

Sam would glance back at me every now and again, just to make sure I was still there. If I was dragging, she would slow her pace a bit so I could close the gap. The closer her ass, the harder I ran. But if she ever looked back and saw me immediately behind her, she picked up the pace again, and I seriously struggled to stay with her.

In all fairness, she had been consistently running five miles or more every weekend for who knows how long. This would be the first time I'd tried to run five miles since... Actually, I'm not sure I'd ever tried to run five miles before. I almost didn't make it home. By that point,

I didn't even care that we'd never stopped to have outdoor sex. I was too worried about having a heart attack instead.