"Yo, what's up with your sister lately?" Tom asked, well out of earshot of Maya.
"What do you mean?" I asked cautiously.
Did he know what we were doing? Had he found out somehow? Even though we were just warming up, I felt a drop of sweat roll down my back.
"She seems different, somehow. Happier. She's smiling a lot more and the two of you haven't torn out each others' throats in a while."
"Oh," I said, relaxing. "No, I don't think so."
"I figured you would be the one to know. That reminds me, do you know if she has a boyfriend? Or a girlfriend?"
"Why?"
"I was thinking of maybe asking her out for a coffee sometime."
"I see," I said, resisting the urge to punch him in the face. "No."
"No what?"
"She doesn't have a boyfriend."
"You think she'd go for me?"
Fortunately, I didn't have to answer that question as Maya chose that time to loudly yell across the track.
"HEY, LOSER!"
That was, of course, me. I looked at her waving her arms for my attention.
"What?" I called back.
"Catch me if you can!" she shouted.
Before the words even registered in my brain, she turned around and started running. My muscles kicked in and I quickly ran after her.
We were supposed to run a five-mile course today, through actual fields instead of the rubber track. Behind the football field was a small thicket of trees and a cornfield behind that. Plenty of easy-on-your-feet dirt tracks that were well worn over the years.
At a moderate pace, it would have taken us anywhere from thirty to forty-five minutes, depending on how hard we wanted to push ourselves. Maya was sprinting at top speed.
"Hey! Slow down you two!" Coach yelled after us.
Neither of us listened. By the time I crossed the football field, my legs were already burning but I gained some distance on Maya. I was close enough to see all the muscles in her legs and, more importantly, her butt. That perfectly shaped, firm ass. Fortunately, running kept me from having an erection.
The problem was Maya was damn fast. Faster than me unless it was a particularly good day. Today had to be a particularly good day or at least I willed it to be. Even though running on grass was a lot easier, each footfall still jarred my body.
Nevertheless, I pressed on, ignoring the burning muscles in my thigh.
When we reached the entrance of the thicket, Maya risked looking around to see how close I was. Her smile reached from ear to ear and her eyes were sparkling with delight. She was sweating as much as I was.
"Hurry up, loser!" she shouted.
That was her mistake. I didn't reply, I only kept running. We were halfway through the thicket when I was close enough to touch her. Fifty more feet and I caught ahold of her wrist. Suddenly off-balance, Maya stumbled.
We careened off the path, between two big tree trunks, half stumbling, half running with little control. My foot caught on a root and suddenly I tasted dirt. Maya yelped and went down with me.
When we finally came to a halt, both of us were laughing with excitement. My foot, thigh, and elbow hurt but I had something more important on my mind. I shoved my hand underneath Maya's t-shirt and under her sports bra and squeezed her right breast. She let out a happy gasp.
With my free hand, I pushed down my shorts while she was removing her own. My sister's pussy was perfect, even covered in a sheen of sweat and dirt. I grabbed her thigh and positioned myself between her legs.
It didn't matter how many times I've done it now, it still felt amazing to enter her. She wrapped her legs around me and we fucked on the forest ground with animalistic passion. Powerful, raw sex that left both of us breathless after we came.
After my first and her second climax, I rolled off of her and we laid next to each other, recovering our breath.
"I'm still waiting," Maya said.
That's what she always said after we fucked. Ever since the day of kitchen sex and she told me she expected me to "try harder." She was waiting and the problem was, I didn't have any good ideas.
What was more extreme than fucking her in the ass in the presence of our mother? Everything else seemed to pale in comparison to that.
A group of runners passed roughly fifty feet away. I looked up but there was a tree with large roots between us and the road. Nobody could see us.
"What would you do if someone caught us?" Maya asked quietly.
"I don't know. Probably die of shame."
"You're embarrassed of me that much?" Maya pouted.
"No, that's not what I meant, I simply—"
"Relax," Maya giggled. "I know what you mean. Our lives would be done for."
"Yeah," I sighed.
"But that's what makes it so much hotter, right?"
"I don't know. I could go for a nice romantic bath with nobody around for miles."
"Boooring! If I knew how much of a prude you are I never would have let you tap this."
"Let you?" I asked, annoyed. "Remember, I was the one that fucked you on that bus."
"Ugh, that was so much hard work," Maya groaned. "It took me weeks and weeks of getting you angry enough to work up the courage. I literally had to tell you to feel me up before you even got the idea."
"Weeks?"
"Months, really."
"I had no idea."
Thinking bad on the last couple of weeks, it definitely seemed like we had been fighting more. She had been thinking about me that way the entire time. I wish I had known so she didn't have to suffer in quiet.
"That's because you're an idiot. And you're unimaginative. I'm still waiting."
"I guess I should spill the surprise, then," I said.
"Oh?" Maya asked, perking up.
"I was going to wait until you missed your next period but last week I replaced your pill with fakes."
"WHAT?" Maya shouted and instantly sat up.
With wide eyes and a slack jaw, she stared at me. I tried to keep my composure but seeing the ridiculous look on her, I couldn't help but crack a smile.
"You asshole!" she growled and slapped my shoulder.
"You should have seen the look on your face!" I laughed.
"Oh, God, I think my heart stopped for a second," Maya said, lying back down.
"Looks like I finally flapped you."
"That one doesn't count."
"Why not?"
"Because it wasn't at all filthy."
"You said you are unflappable, not you are unflappable-but-only-in-perverted-scenarios."
"It was implied, dumbass."
"Are there any limits to what I should come up with?"
"None as long as nobody finds out we're fucking."
"Really? None?"
"None at all."
"What if I want to poop on you?"
"Then we wouldn't be doing this in the first place. I know you pretty well, baby brother, and I trust your judgment."
***
"Oooh, what's this?" Maya squealed with delight.
In front of her, on her own bed, laid an assortment of instruments. A blindfold, sexy lingerie, two sets of handcuffs, a nylon rope, nipple clamps, and a butt plug.
"I hope you're okay with being humiliated, slut," I said in a commanding voice.
"I definitely am but I'm afraid this is all pretty vanilla stuff," she fired back, pulling her t-shirt over her head.
"How often have you used handcuffs during sex before?" I asked in a less commanding voice.
"Well, technically never, I suppose, but it's still pretty vanilla."
"Uh-huh. We'll see how you feel about that later."
Bare-chested, Maya picked up the nipple clamps and attached them to her nipples. A thin, silver chain connected them, and she tugged on it, stretching her nipples.
"I like this."
While she was distracted playing with her nipples, I pulled down her yoga pants and planted a kiss on her buttcheek. She retorted by slamming her butt in my face, knocking me on my ass.
"Don't kiss my butt, that's weird," Maya said.
"So fucking you in the ass is okay but kissing it is not?"
"That's right. Now get on with the kinky stuff, I'm horny."
"As the lady commands," I said, scrambling to my feet. "But first things first, show me how to unlock your phone."
"Why?" Maya asked suspiciously.
"So we can make some memories, of course."
"Why not use your own phone?"
"Does the thought of me accessing your phone make you... flapped?" I suggested.
"No, not at all," Maya said stubbornly, jutting out her chin. "Fine. Give it to me."
I grabbed the phone on her desk and she put in the code. A circle, counter-clockwise, starting with the top right corner.
"Thank you. Now it's time for the blindfold."
Once she was blindfolded, the process was quite a bit easier. I led her by the chain to the bed and had her lie down. True to her words, she was incredibly horny. The opening of her vagina glistened with grool. I probed with a finger and licked it clean.
"Hands up."
Obediently, Maya raised both of her arms, pressing her wrists together. I grabbed both sets of handcuffs but instead of locking up her wrists, I cuffed each hand with its own set. After hearing the second cuff snap shut, she tested her new restraints.
"What's going on?" she asked, gesticulating wildly with her arms. "Why am I not locked up?"
"Feet up, my dear sister," I said, hoping she could hear the grin in my words.
"Ooh," Maya squealed and raised her knees to her chest.
I cuffed her left arm to her left ankle and her right arm to the right ankle. She was still able to move her limbs somewhat freely, save for not being able to put her legs down anymore. A rivulet of grool flowed out of her vagina.
"Now it's time for the rope," I announced.
"Yes, please. Tie me up and use me like a sex toy."
The rope was meant for climbing and had a strength well in excess of anything Maya would be capable of. I climbed up on the bed and looped one end around the back bedpost. With two strands in hand, I wrapped one end several times around her ankle, underneath the cuff, and tugged on the other end until Maya toppled over to the side.
"Does that hurt?" I asked.
