She goes a bit far

Licking, tasting but not sucking or penetrating, you continued to lavish attention on your sister’s pulsing pleasure organ. She sat, legs speared to either side of your small shoulders, prepping to modify her own form, although… for all you knew she had already transformed herself.

You grunted, pulses of pleasure coursing through you as your small dick spurted a couple of times, plastering the front of the couch with your sticky seed causing you to stop your ministrations momentarily.

Still consumed by the blissful waves coaxing through you, you barely paid attention to your sister’s groan of annoyance at your having left her pussy alone.

Through the haze of orgasm you watched your sister, phone in hand, while the other mauled her massively oversized tit.

Caris had the biggest set of boobs on any human being as far as you were concerned. Big enough that her entire tummy hid behind the massive breasts, she tried desperately to reach for the sensitive nipple but her hand only sank into the side of the supple orb.

“OK, maybe a little too big.” she said, frowning slightly as she looked back at your phone.

Too big? You wondered in that faraway place your mind resided in.

As your mental faculty’s returned, you remembered where you were moments before and dropped your head once more, resting your chin on the couch so you could lazily enjoy your sister’s flavor with long licks once more.

“F-FUCK!” your sister winced, evidently not prepared for you to start in again.

“Oh, sorry.” you say with a dopey grin, slowing the pace just slightly for her.

You looked up between her big but not obscene pair of tits as she looked back with a mix of arousal and anger on her face.

“Fine, want to be a smarty dick then? What about this!” she said, quickly scrolling through the list on your phone as you leisurely licked her sweaty hole.

Her hand moved quickly, from one edge to the next.

“There, how do you like that, slut?” she said aloud.

Her body shifted massively in an instant, one which went purely unnoticed by your oblivious mind.

You could barely hear her muffled words, still licking her soft hole, you sat in darkness, hands up around the space your head lay trying to lift your sister’s heavy sack so you could get a bit of air to breath as you tantalized the little entry.

The confined space was hot, sweat trailing down to collect on your body and the couch, the air soaked with your sister’s heady smells.

Muffled through your sister's obscene manly endowments, you could hear her moans reach a new level, apparently excited by some part of your ministrations down here.

You breathed in the hot air, soaking her quim in even further heat that stuck to your tongue and gave a sheen to your lips.

Only one arm stood available to you now as your cock felt a phantom you could not see down below. So with all your might, you pushed up on the heavy sack above you.

“GOooooohhhhh-nnnnnghhhh…” your sister moaned aloud as her pussy began to shiver and pulse lightly as her orgasm apparently came all the while you continued to lick her sweet honeypot.

The massive sack that held her nearly human sized balls behind you pulsed physically with the gargantuan haul your sister held within. Veins pulsed over and near you on the fleshy container, Caris mewling and moaning like a crazed person. The sound only partially got through the much louder noise of her gargantuan load pulverizing whatever unfortunate wall was on the other end of her member.

You as well could feel the on coming climax as your cock felt a phantom hand caressing and stroking, picking up pace subconsciously as the huge sex organ over you expelled what was probably a pools worth of fluid out into your family’s living room. Heat soaked into and on you, causing your sexy body to sweat even as your sister’s juices and sweat also slid slimy down your form. The air felt as if it only contained your sister’s heady smells now as your breathing became strained with the lack of oxygen.

So as your own cock finally spewed what little alabaster cum it could muster, your mind fled, exhaustion and lack of oxygen depriving your senses of the bizarre situation you found yourself in. You collapsed into the sweet tasting stink of your sister’s hole, the weight of her insane balls driving you into a comatose sleep.