Chapter 1: Liftoff

Exhausted from a busy day interning at the library, I slumped into the back seat of Jasmine, our family car, after she picked me up, and I fell asleep almost at once. But with her being an AI, I was not surprised to wake up 15 minutes later to Jasmine's announcement that we were home. I sat up groggily, ran my fingers through my many tight braids, and groggily picked up my book-bag and got out of the car.

"Welcome home, Rianna," said our house AI, Faraji, as I came in. I was already starting to wake up more, the nap having done me some good.

"Thanks, Faraji," I idly said back, heading up the stairs to the room I shared with my 14 year old younger sister Kamaria. I opened the door and already had my bag on the floor by the door when I looked up and saw Kamaria laying in my bed, reading a graphic novel on her e-board. She was in her bra and panties only. With her skin a slightly darker shade of rich brown than my own and her big, fluffy, curly natural hair crammed into two cute Afro puffs, I took a moment to just appreciate her dark beauty. Kamaria's body is slightly thicker than my own lean frame, but the puffy swellings on her chest were already larger than my own had been at that age, and I'm four years older than her.

I should specify here that, because we are of the Paxite sub-species of humanity, we have an extended adolescence to offset our sub-species' extended lifespan, and so though she was 14, to the eyes of a Terran she would have appeared somewhere around 11 or 12. As to myself, at 18 year old, a Terran who didn't know I was a Paxite would think me 13 or 14. But our mental maturity was the same as a Terran's at that age would be, and there are differences in how puberty works for us that mean our appearances are further deceptive. For one, though our puberty is slower and more gradual, it starts at age 8 or 9. Compare me physically to a 13 year old Terran who was a fellow t-girl, and the differences can be seen. I have a larger girl cock, for one, as it's currently up to 7 inches in length when erect. My hips are slightly wider, too. Terran kids also tend to have this stretched-out look to them, like they've shot upwards too fast, that Paxites don't usually have. And most importantly, but impossible to see, I've been horny since I was 12. Not as intensely as a Terran going through puberty would be, but still horny, and I've been able to make myself come since then as well.

Kamaria turned her amazing hazel eyes up at me from her graphic novel and grinned. She sat up, and the slight bulge in her panties was more obvious. I'd long wondered what hers looked like, for I had always turned away with embarrassment whenever she took them off to change, but though we've been snogging each other for years, we've never had sex, and I didn't want to be the one to suggest it.

"Enjoying what you see, I notice," she said impishly. I took my own shirt off and tossed it at her with a snort of amusement. Then I slipped out of my skirt and kicked off my shoes, and joined her on my bed.

"Now we're both in our knickers," I joked, leaning forward to kiss her on the forehead. She tossed her e-board aside and rolled on top of me, kissing me on the lips.

I never get tired of Kamaria kissing me. We got started when she was 11 after coming back from a class about how to kiss, that is part of standard sex education on Paxum, and wanted to practice on me. So by now our kisses were deep and powerful, with lots of passionate clutching onto one another's shoulders and backs, which sometimes left marks.

Kamaria began to writhe her body along mine sensuously, grinding her groin against my own in a dry-hump that had my girl cock painfully stiff with desire. My hands found her butt and grabbed, and I began to help along her grinding motions. I could feel her own girly stiffness against mine, and could tell she was just as hard as I was.

Her own hands were massaging my B cup breasts through my bra, and I could feel my nipples getting hard as diamonds. She began letting one hand roam downward along my belly and then, to my surprise and joy, into my panties, rubbing my girlcock with her hand. At this point, she pulled gently out of the kiss and asked, "Enough of this pussy-footing around. I want to suck your girlcock, and unless I'm mistaken, you want me to, too."

"Oh god yes, please!" I'd been waiting years for her to ask me that. She chuckled delightedly at me, and began sucking on my earlobe. Knowing my sister as I do, she wasn't the wham-bam-thank-you-maam type. She sucked on my earlobes with gusto, and slowly worked her way down my neck to my chest, where she quickly helped me out of my bra and spent a few minutes on my nipples. As she did, I spared as much concentration as I could to slip out of my panties. Kamaria stopped sucking my nipples briefly while she, too, slipped out of her bra and panties, then went back to work.

She was doing so well I almost cried when she moved on down my belly. I got more and more excited as she got closer to my swollen brown stiffy. Still she teased me, by kissing and licking along my inner thighs, working her slow way inward. It was clear that the sex education and years of reading porn stories was paying off for both of us.

Kamaria began kissing and licking my testicles, even sucking on them. I really was crying now, with frustration, but if she noticed at all, it only made her happier.

Finally, I felt her hand pull back my girlcock's foreskin, and her tongue began to tickle my pickle. I'm surprised I didn't come on the spot, with all that teasing. I wondered how much more I could take.

From licking my shaft, she moved on to licking the head in teasing circles, before finally, mercifully, putting the head and then the shaft into her mouth. She must have gotten a lot of practice on the robotic cock in sex ed, because I could have sworn she was a pro, the way her tongue massaged my cock. But far from giving me relief, I just built higher and higher, the tears of frustration coming in floods now. I began silently praying I would bust a nut soon.

How long she sucked on it, I don't know, because I had lost all track of time. But eventually she paused and looked at me in a way that said 'Still nothing?' And I could only look pathetically down at her. She kept trying some more anyway, for a while, but though my back was arched and my hands were almost ripping runs in the sheets from the tightness of my grip, I still couldn't get over the hump. After a while of this, she stopped, and I relaxed back onto the bed, crying.

My sister, my lovely sister, it wasn't her fault. I didn't blame her. Years of masturbating must have made it hard for me to come without it being my own hand doing it. Kamaria crawled up next to me and ran her fingers through my braids, kissing my cheeks and forehead, and speaking comforting words. But I was still hard.

Once I calmed down enough to stop crying, I gave her a half-smile. Kamaria smiled back, got up to stand at the foot of the bed, and asked, "Want me to stand here playing with myself while you finish up?"

"Oh god yes," I enthused, and so she pulled up a stool and leaned against the bedroom door, one hand rubbing her nipples while the other stroked her girlcock for my viewing pleasure. I sat up and, with some lube in my hand, watched her as I stroked myself off.

It did not take long before I was very close. I held back and said, "I'm almost there. You at all interested in catching it?"

"Very much so," she said and hurried over onto the bed. When she got into position with her mouth open almost right over my penis, I stopped holding back. Within seconds, I shot a load right into my younger sister's mouth. More than one, actually. There were three shots of it from one orgasm, and then it stayed hard. Kamaria did not move as I stroked again to a second orgasm and two more shots of hot sperm. Finally, my cock was going limp again.

However, as I saw my white cock cream all over her tongue and watched her close her mouth, swallow it, and open her mouth back up to show me it was all gone, I felt a stirring down below of my cock getting halfway hard before going limp again.

"Goddamn, lil sis, that was hot."

She giggled. "Thanks. What part?"

"All of it, but especially the part where you caught my spunk and ate it. How does it taste? I've never been interested in tasting my own."

"Salty and wet. Not bad. Maybe after dinner we can trade places."

She crawled back into bed with me, and we lay there cuddling and talking about what we'd just done. Kamaria agreed that I was probably too used to coming by my own hand, but she had some ideas how to fix that, though she didn't let me in on what those were. I didn't worry myself about it.

We were still snuggling naked in bed when Mom's voice came through the intercom, telling us dinner would be ready in half an hour. Suddenly realizing we were all stinky and gross from fucking, and that the sheets were soaked in sweat, we quickly got up, replaced the sheets, and tossed the dirty ones in the hamper. Then we ran, still nude, to the attached bathroom we shared and took a quick get-clean shower together before changing into some comfortable clothes. Though we hurried, we got to the table with only a few minutes to spare, and hurriedly worked together to set the table, Mom looking confused at us the whole time, presumably since she'd given us plenty of warning, in her opinion.

Before long, there were six people seated at the dinner table. Me, Kamaria, Mom, Dad, and the twins Imari and Jabari, both of whom were 12 years old and were presenting as boys this week, though they kept switching back and forth and were rarely presenting the same gender at the same time. Our older sister Ebele, a cis girl, was in Mocksville Medical College studying to be a doctor, and so had her own place somewhere in Mocksville.