Sam got a bit of an evil wry grin on her face. "ALL this time trying to make myself your favorite through topping what the other girls could give you... Maybe I should've tried leaving you sooner."

“Don't you dare."

She laughed, which did wonderful things to her core muscles and therefore did wonderful things to my re-hardening prick surrounded by those core muscles. Feeling the energy surging back to my loins, I switched from slowly grinding her to withdrawing a few inches and fucking myself back inside her.

“Ohhh, Matty..." she groaned. "You're really spoiling me."

"I aim to please."

"You do..." she sighed as she rolled her hips and took up the pumping motion. "You do... Ugh, but the floor is pretty hard. Let me up.”

Withdrawing my now fully-hardened dick, I sat back on my heels while

Sam got up and climbed onto the sofa facing away from me, pausing to finally remove her panties and workout pants from her calf and ankle.

Now fully naked, she braced herself against the backrest and waggled her perfect ass invitingly. And I was quick to settle behind her and slide myself back inside.

“Mmm, fuck me, Matty..." Sam crooned.

“Fuck me, lover..."

“I'm fucking you, Sam. I'm fucking you."

I pumped her slowly and let my hands roam all over her silky-smooth skin, stroking her spine and tickling the sides of her pendulous breasts before bending over to cup them and fondle away to my heart's content. But just when we started picking up speed, she Looked back at me with a new fire in her eyes.

“Put it in my ass, Matty. C'mon, I know you've been dying to for weeks, especially after running behind me for all those miles yesterday. You couldn't take your eyes off my juicy, round, bubble butt encased in skintight workout pants."

I blinked. "Uh, the lube's upstairs."

She shook her head.

“Mari said she took it without any Lube. Neevie, too."

I pursed my lips.

“You really ARE fucking competitive, you know that?”

Sam giggled.

“Of course I know it. Now shut up and sodomize me." She braced her chest against the backrest and reached back with both hands to spread her own cheeks.

By now I knew my dick was coated in both girlcum and my own previous load. Hoping it would prove to be enough natural lubrication, I pulled out of her and stared down at Sam's crinkled anus. For good measure, I bent down and spit on her sphincter, figuring it couldn’t hurt. And then holding just the base of my soaking wet schlong, I positioned my mushroom head at her anal entrance and started pushing in.

“Nnnngggguuuuuuhhhhh..." Sam groaned, trying to relax herself. To my surprise, I managed to push inside with only a little resistance. It wasn't as easy as entering Mari unlubed, but it was nowhere near as difficult as that night in Tahoe when I first tried to get into Sam's ass even with Lube. And after about a minute, I was balls-deep inside my lover's colon.

“Fuck my arse, Matty..." Sam moaned, still holding her own asscheeks open for me. "Fuck my arse..."

The next several minutes were the cherry on top of an already incredible day for me. After the lunchtime nooner with Naimh in the minivan and the later trifecta in the afternoon, I hadn't needed nor expected any further sexual encounters. My request for Sam to come over and talk had been purely for platonic reasons, and yet here we were at the end of yet another marathon sex session.