Well, since she asked so nicely...

“Um, sure.” I said a bit hesitantly, still waiting for the other shoe to drop and for this all to be revealed as some weird prank or dream.

Vanessa smiled and quickly lifted off her plain, white t-shirt, flinging a bit of the cum that was still on it across the hallway. She was now only wearing her pink polka-dotted pajama pants and her amazingly huge, natural rack was displayed in front of me. I noted that the two of us had the same, puffy pink nipples, though hers were obviously set on a much larger pair of breasts.

Once her mammoth tits were free she pounced on me, knocking me to the ground. With a long whiff of my cock she grinned. “Oh yeah, the smell is definitely coming from this monster. I wanna suck it so baaad.” She dragged her tongue along the shaft of my new penis, bringing a moan out of my lips from the new sensation.

“Fffuck, Vanessa.” I say through clenched teeth as she drags her tongue along my length once again with a giggle.

“Doeth it feel good, thith?” She asks with her tongue out, dragging it along my shaft a third time.

“Yeah this feels fucking amazing.” I said and wasn’t lying. I had never felt anything like this before. I’d always dreamed of having a cock but I never expected that I would actually have one. And now that I did, it was twice as amazing as I could have hoped for. Somewhere in the back of my mind I was still perplexed by the fact that my twin sister, who I was almost positive was straight, was coming on to me so strongly.

After one final lick Vanessa beamed. “Good, then you’ll love this.” With that my big-titted sister slipped the tip of my cock between her lips and impaled herself on the length, going down as far as she possibly could.

It took every ounce of willpower I had not to scream in pleasure. I clenched my teeth and dug my nails into the carpet as hard as I could to avoid it. I could find it conceivable that my sister would do something like this through some strange circumstances and misunderstandings about her personality while growing up. I was not as convinced that my mother would walk in on this situation and be totally fine with it.

Vanessa wasn’t able to take it all the way it seemed, as she gagged slightly and came back up for air soon after, biting her lower lip and moaning with delight. “Holy shit that felt so good in my mouth and throat. Better than any dick I’ve had in there before. And it’s much bigger than any dick I’ve ever sucked.”

Given how many I was positive she had sucked before, that was definitely saying something.

Without saying anything else and just leering at my cock with a hungry look in her eyes she lowered her head, once again impaling herself on my member. This time she slid down more easily and actually managed to go down lower than before. Once she was as low as she could go her eyelids shot open to reveal that her eyes were rolled back in absolute bliss.

Now, I wasn’t an expert on blowjobs, but I was almost positive this kind of reaction was unusual. It was almost like she was orgasming as she was deepthroating me. I got the impression she enjoyed sucking cock, but I had a hard time believing that she was this into it. I didn’t have much time to think about it because I already felt the pressure in my groin again.

My cock twitched over and over and Vanessa seemed to understand exactly what this meant. She quickly slid most of the cock out of her mouth until only the tip was between her lips and looked up into my eyes with anticipation as her hand swiftly jerked my length.

The sight of my own sister doing this to a futa cock that was actually attached to me sent me over the top. I exploded into her lips with an orgasm that was even more intense than the one I just had a moment ago. Through my slightly failed attempts at not moaning at the top of my lungs I could hear her chugging down my load, seemingly waiting until her mouth was completely full before swallowing each massive load of spunk. In-between gulps I could hear her humming with pleasure as she sucked down everything I had to offer.

My orgasm lasted for what felt like an eternity as I dumped load after load of girlspunk into my twin sister’s eager mouth. When it finally ended I was exhausted, slumped on the ground panting like crazy.

Vanessa seemingly hadn’t had enough yet as she was licking my shaft over and over, cleaning off whatever remnants were there. “Ohhh my god sis, that was sooo good.” Vanessa said almost hazily, like she was drunk off my sperm. “I don’t think I need breakfast anymore.” She giggled.

“That was… pretty awesome for me too.” I admitted, still out of breath. “But why aren’t you freaking out about this, Vanessa? I have a cock!”

“Mmmm yeah you do.” Vanessa wiggled her brows as she lightly caressed the flaccid shaft. “It’s honestly the best thing I could have hoped for, my own baby sister got a cock of her own and its way better than any shlong I can find outside of a porn flick.”

I cringed slightly when she called me “baby sister”. She always called me that even though we were twins, insisting that she was the more mature one.

“In fact, I don’t think I’ll ever need any other cock but this one.” She winked and got up off the floor, picking up her top as she did. “Gonna go take a shower now.” With that she disappeared down the hall out of my sight, going off like nothing unusual had happened.

Now the universe had to be fucking with me. There was no way my sister would give up every other dick in the world but mine. Perhaps she was exaggerating.

She’s not. I heard a voice say. This caused me to immediately jump up and look around my room. When I peered over to my bed my eyes widened at what I saw.