While she calmed, I slid up next to her, her arms coming around me as she kissed me gently.
“I love how I taste, Bobby, but only from your lips!” she murmured, licking my lips as I nibbled the tip of her tongue. “Your turn, now, my big little brother!” she smiled, urging me onto my back while she hovered above me.
She kissed me even more urgently now, her hand meanwhile squeezing and pumping my aching cock. She slid down me and slipped my cock into her soft, hot mouth, her head bobbing as she sucked while continuing to jack me.
I was in heaven; the heat and suction was one thing, but add-in the additional stimulation as she pumped my cock and gently squeezed my balls, and I was at the brink in no time.
“Uh Sylvia, darling…!” I tried to let her know what she was doing to me, how close I was, but I guess she knew, because she sucked even harder, and jacked me even faster. I came like a torrent, like a blast-furnace, pulse after pulse of white-hot sperm blasting out of me and into her hot mouth, while her throat worked as she swallowed every drop, sucking the last remnants out of me and even polishing the crown of my penis with her soft tongue, cleaning away the last traces of my explosive orgasm.
“That should hold you for a while, Bobby-Dazzler,” she grinned, “You haven’t had your present yet!”
With that, she slid back up to lie against me, my cock firming-up again, as I knew it would, because of what she did to me. She grinned as she once more took hold of me, but did nothing else, just held me, while she held my gaze with her luminous hazel eyes, almost green in the moonlight.
“Tonight’s a special night for you, my darling Bobby; it’s your twenty-first birthday, and that’s a special number. Tonight is all for you Bobby, because I can’t come back to you like this again. No, please, listen to me!”
I subsided while she continued.
“You’re an adult now Bobby, and so you have to take responsibility for your actions. This, what we have here, lovely as it is, has to stop, it can’t continue. You have to find someone who can really be everything to you, and who you can be everything to in return; life has to go on and go forward for you, Bobby. I’m your sister, and we can never be; one day, perhaps, when your life is full and complete, you’ll understand what I mean. But tonight, I’m yours, in every way you can think of, because I can never be yours again after tonight. So love me, Bobby, then let me go; look at me Bobby; you know this is how it has to be.”
Tears were streaming down her lovely face, as they were on mine, and she reached up to gently wipe them away.
“We’ve had three years, Bobby. I’ve showed you everything a young man should know. I’ve fulfilled my promise, the one I made the day you were born, to make sure you would one day be all you could be, to show you what love was and how to find your way, so go and be free Bobby. You will be happy, I know, and so will I, because my own little Bobby’s happy too. I love you, Bobby-Dazzler.”
I was too overwhelmed at first to do more than hold her as the prospect of never doing this with her ever again loomed, and Sylvia held me as I tried not to cry, but eventually even the impending loss couldn’t disguise the fact that a hot naked girl was in my bed, her body glued to mine as she kissed my tears and gently rubbed her warm hands up and down my back. I could feel myself beginning to respond, something she noticed immediately.
“There you are, there’s my horny little brother! Back and ready to play again, Bobby?”
I looked up at her, but she wasn’t laughing at me, just smiling that sweet, sad smile that belonged only to me. As I smiled back, she leaned down and kissed me, and once again the need for her possessed me, like fire running through my veins.
I kissed her back harder, almost viciously, determined to take every last scrap of sensation I could from her, hoping against forlorn hope that the taste of her lips would somehow imprint itself into my lips so I could taste her forever.
Sylvie squeaked in surprise, then kissed me back with equal vigor, not resisting me in the slightest as my hands plundered her, and my cock was like a bar of solid fire, burning between us as we kissed like fiends, almost hard enough to bruise our lips.
My hands slid under her, pulling her up against me, and as her thighs parted I lifted-up and slid home, thrusting my swollen cock as far into her as I could, reveling in her gasp of mingled surprise and pleasure as I pounded into her.
Sylvia thrust her hips back up at me, meeting me as I rammed into her, with no attempt at finesse. This was what I wanted: to fuck my sister raw, to jam myself into her as hard as I could, and to fill her forever with a part of me. Sylvia seemed to understand this, and so her response to me was as savage as my pounding of her, both of us hammering at each other like things possessed, lust and the need for release governing us now; if this was to be my last night with her, it had to be one to remember.
Sylvia came in a rush of warmth, her wailing cry cutting through the fog in my brain, and meeting something deep inside me. I came, like thunder, like a summer storm, a barrage of sperm shooting out of me and into her, filling her entirely with myself, endlessly pouring out of me, draining me dry, or so it seemed.
I slumped down next to her, almost too weak to move, muscles trembling and twitching in adrenaline-shock, while Sylvia gasped and trembled next to me, winded and quivering as aftershocks rushed and curled through her.
Eventually we turned to look at each other, and immediately began to giggle, then laugh, all the tension of the last few minutes finally draining away. As the laughter died away, Sylvia turned to face me, her makeup somehow miraculously intact in spite of the sweat and fervor just past.
“So Bobby, is that all you want for your birthday?” she grinned, her finger tracing a meaningless pattern on my chest. “Are you sure there’s nothing else? Last time’s a charm, you do know that, right?”
I grinned at that, at her wheedling expression, and now, once again, as if by magic, my penis was responding to her, stiffening until once again I had an improbably full-blooded erection.
“Now you’ve got that thing, what do you plan on doing with it?” she grinned slyly, “After all, I haven’t got all night, but I think I know what to do to make this special for you. Come here, Baby Brother!”