Return the "favor" ( ͡° ͜ʖ ͡~)

“I…uhh…I want to return the favor. How do you want to cum?” I asked my brain, still foggy from cumming so hard.

“I am a tall girl…I need something long enough to reach about here,” She said pointing to a couple inches below her belly button. “You think you can help me with that? All the other guys haven’t been able to reach but I have a feeling that won’t be a problem for you,” She said in a throaty tone as she looked up at me with sultry eyes.

“Oh…I see. I have just the tool for the job,” I replied as I got up and pulled my sister up on her feet.

“Mmmm…come on. I am leaking bad, and I need someone to lay down some good pipe before it starts to flood,” She said as she grabbed my hand and guided me to her bedroom. From behind I got to admire her well toned back, long runner’s legs, and tight ass already dripping with girl-cum. When we got into the bedroom she locked the door before going to kiss me, her hands needing my breasts playfully, her thumbs rubbing circles around my hard nubs. I kissed back with surprise, humming into her mouth as I leaned into her, my cock pressing against both our warm stomachs.

“You don’t mind–”I tried to whisper, feeling conflicted.

“No. You're perfect. We have always been so close…and you love me. Care for me. Don’t just want to get into my pants,” She whispered back. The complexities on her face were clear as day, shame, love, sadness, and lust shifted to determination as she pushed me onto the bed. She crawled on top of me, her legs straddling mine. Her warm sopping cunny started to glide over my hard throbbing cock.

“I want this. I want you. I want you to make me forget about anyone else,” She said, looking down at me with frustration, anger, and hunger. Her hands went down to my torso as she sat up and grinded her hips onto me. I moved my hips with hers, have the bumps on my shaft glide across her clit making them whimper. She pinned my hands down when I tried to raise them to hold her hips, giving me a stern look as she bit her bottom lip.

“Bad…trying to make me cum before I even put it in. I am supposed to be in control, I am the eldest. Be good at let me put it in at my pace,” Petra said dominantly as she lifted her hips and took one hand to grasp my cock, pulling it skyward. It wasn’t difficult for her long legs to rise up high enough for the spongy crown to be pressed against her entrance.

“I never taken anything so meaty, little brother. We're going to have to take it slow,” She cooed, looking down at me with lidded eyes as they rubbed my fat tip around their entrance. When she started to lower her weight, I could tell she was going to be really tight because even though she was dripping wet my girthy tip was going in. With an annoyed groan she pushed down harder having it finally pop into her hot cunt, an overly snug fit over the first couple inches. Her mouth gaped as she gasped, the air in her lungs leaving as her eyes went wide, and her nails dug into my skin. I too felt the sudden intense pressure as I groaned and kept my hands to the sheets like a good boy.

“Your so tight big sis,” I mewled in a high needy tone,

“Mmm…gods…you're tearing my tight pussy apart. You might just ruin me little brother,” She said lustfully while rubbing her clit, her juices drooling down my long slicked shaft. After slightly more used to intense sensation she proceeded to inch her way down, each bump on my cock a delicious obstacle to overcome. Moaning as she went her hands were on my firm stomach for support, her beautiful brown eyes looking at me the whole time. I kept still and encouraged her with my own pleasured faces. Each inch a hard fought victory her sticky pussy marched down my 13 inch cock as if going through high water.

“Your so fucking pretty,” She said looking at me, making me blush in surprise before as we moaned together, as she pushed deeper. Her words made me feel warm.

“You're really pretty too sis,” I said softly moaning. And before we knew it, she was at the halfway point.

“I never had a dick deeper than this little brother. And you still have so much more to give. You feel so good already,” she praised as she put a hand over her lower abdomen, where I was. My cock was so hard, there was no give as she went down and stretched herself taut over me. Closing her eyes, she pushed me deeper into her. We relished each minute it took before my hat flared glans was pressed at her cervix at only around 9 inches of me in her. At the same moment her body arched and quivered as she came around me, her eyes rolled back as she was breathlessly moaning.

“Ahhh yes. That’s the spot…,” She mumbled as she caught her breath. She squeezed my base and knots, having me squirt pre right at the entrance to her womb making me moan.

“But you still have more to give…I wish I could take all of you…I wish to be your’s little brother,” She said lustfully as she pressed down and circled my cock to rub around her cervix as she shivered. In that moment, you knew that she offered the deal with you without even realizing or being prompted. A similar glowing pink tattoo glowed to Diana’s, marking her uterus, and marking her as part of your harem.

“You want it all? You want to be all mine” I moaned, smiling, watching her lidded eyes full of need.

“Yes! I want you to ruin me. I want to be no one’s else. I want you to make me cum on your cock from this day forward,” She moaned lewdly with need as she bounced up and down a few inches to pound her cervix roughly and stretch her deepest spots. In that moment her stomach felt a warm burn and the seal was made permanent. I was her master. And the next time she pushed down her cervix gave way as my cock penetrated even deeper as it entered her womb, hitting the back wall as my knots popped into her. Being stuffed completely for the first time had her orgasm like never before, as visions were transferred between them as the link was made. She shivered and squirmed as her pussy clenched and spasmed being remodeled into an even more perfectly snug fit for my monster cock. When Petra regained full consciousness after having an outer body experience, she implicitly understood their bond and smiled wide, reveling in the intense pleasure she was feeling just by grinding her ass down onto my crotch.

“Little brother…you're so amazing…you fulfill me. So full…,” She moaned, putting her hand over the bump on her slim stomach from my curved cock pushing up towards me. Her body fell forward, having our breasts flatten on each other as her mouths sealed on each other for the first time. A felt a fire in my chest as my cock was feeling electrified as it pulsed and throbbed inside her. I could feel her soul getting stretched and filled at the same time. No one could give her that.

“Sis. I never felt anything so good. Your womb is hugging me so good,” I whispered on her lips before deepening the kiss. When she started to lift up again the hermetic seal her sticky pussy made around me wanted to suck me back into her womb as my knots were pulled out and her wall gripped me tight, getting caught on all the ridges. She was moaning as she slowly took me in and out in long deep strokes, always feeling her womb flutter in pleasure when all the way down. Her cervix felt like a second opening to split open and tugged delicious on my flared tip and foreskin.

“Mmmm…I am in love with your giant cock already,” She moaned on my mouth as she savored every inch that went in and out, her legs at the perfect length to pull up to my head before splitting herself back down on me. Gradually she built up a pace, smacking down on my thigh with her full heart shaped ass. She was moaning loadly going at this pace, giving herself several orgasms from my fucking me up into her womb. Her over-snug pussy was feeling even tighter as she clenched down around me and her womb sucking on my tip with each climax.

“Fuck!…fuck!…fuck!” She shrieked with each rhythmic slam down, as my tip bulged out from her stomach.

“You look so sexy like this sis. I could watch you like all day,” I moaned out as I played with my tits as I was getting closer, my knots and shaft getting even harder. Her taut perfect skin jiggled with each violent pound of her hips. My big sister was basically fucking me into the bed at this point, having me bounce up from the mattress.

“You look good under me! Slut!” She yelled back as she started to twerk her ass onto, her walls rapidly jerking my cock like nothing else.

“Come for me! I want your cum all over me little brother!” She yelled again between shrieks and groans of utter incestual pleasure. It didn’t take long for me to get close at this pace. She was practically a well oiled fucking machine on me. When I had to cum, she came off me with a squelching pop as my raging cock was pointing straight up to the ceiling. Her hands went to stroke me as her tongue swirled around my tip and foreskin. Pinching hard on my nipples I came in my sister’s soft hands. My cum coming out like a hot goopy fountain that sprayed ropes all over her body for over a minute as she milked me good. The fog of climax making me see white before flashes of large harem, with me in the center, as a…monarch? Airship captain? So many possibilities but I was leading the helm with my family right by my side.

“Ahhh! Gods! I love how much you cum. It makes me feel so sexy feeling it cover me,” She praised as she massaged my cum into her skin like moisturizer. Before laying down on top of me while she kissed my shoulder and started to play with my hair as I was gaining back consciousness. “Your cock was a spiritual experience. I think I felt myself literally ascending while riding you. Your going to have to promise to fuck at least 3 time…no 4 times a week. I don’t think I can live without coming home to this on the regular,” She added while gently stroking me with her free hand.

“I promise. I love you Petra. Getting to fuck your womb is just a bonus. A pretty mind blowing one. But still a bonus,” I said softly before giving a quick peck on her blushing face.

“Mmmm. I love you too baby brother,” She said before giving me a kiss back as she pressed her body agaisn’t mine.

“We should take a shower soon,” I said after stewing in her warmth for a few minutes.

“Yeah. Even though your cum smells so good. We both worked up a bit of sweat. For the best,” She lamented.

While taking a shower together she commented on how sore she felt, and that she was feeling it all day, reminding her of me. After making breakfast together and talking like normal siblings again, teasing each other, cracking jokes on the way to school. I realized I was feeling genuinely very happy. I don’t think I smiled as much in the previous several months as I did that morning with her.