A Completely Normal Day (PoV John)

John stuffed his dick back into his pants, which wasn't an easy task given his size. Luckily his sister had swallowed all the cum. Or at least that's what he concluded, because there was none around, and he had definitely been blowing a massive one just a few minutes ago. Bessi afterwards left to her room in a hurry, and John couldn't help but to smirk thinking about what she was doing there right now. Obviously his monster cock made her horny once more. And she had been coming over to play with it often enough to make it clear how much she enjoyed his rod. Sure he would have had an alternative way of solving her arousal, but she chose to not involve him today, obviously. He looked down at the bulge his dick made, reaching down to almost his knee, and was briefly amused by how most men have literally no idea how difficult life is with a huge cock. Most of them wish they had one, but having a very obvious, prominent bulge on display requires a solid mental health. Not only once in his life John had wished his dick was smaller, in example when he had been staring at those delicious titties of Daphne at school for a bit too long, and suddenly not only his pants, but also half his shirt was bulging with a titanic boner. But people got used to it, joked about it, at least most of the time. And that girls considered him the prime source of dick was helpful to get over all the other times.

John was suddenly interrupted from his reverie by a loud moan from his sister's room.
"Boy she must be really horny." he said to himself and laughed. And sure, given her over-sensitive pussy and tits, she was easy to start up. Another loud moan, followed by something banging on the wall. John decided to better go and check. Sure she was clearly working herself right now, but then this whole sex thing had always been completely fine between them. After all there is little to hide if you have assets that you cannot hide.

"You ok?" he wondered from the door. He took a moment to take in the view of his extremely sexy sister, that was at this moment laying mostly naked on her bed. One hand deep inside her pussy, the other fondling her gigantic tits. What he had grown downstairs, she had grown upstairs. And similar to how girls bend their necks when they saw his bulge, boys bend theirs when they saw his sister walking around with tits the size of her head bouncing around. And the rest of her, that cute face, that hot, perfect body, was nothing she had to be ashamed of either.
"S-sooo sensitive..." she moaned and rolled her eyes when her hands sunk into her tit-flesh again. John grinned. That **** sensitivity of her tits and pussy had always made her get lost in situations like these.
"If you need help, let me know..." he offered naughtily, and couldn't help but to imagine his big tool between those gigantic tits, sending some unwanted blood down into his pants. Her eyes went down to his expanding bulge, and with desperation in her eyes she moaned a simple "Yes!" While this wasn't all to precise, John still took the opportunity for some fun, closed the door, and went in to get his hands onto some delicious boob-mountains.

"This feels good?" he asked when he started rubbing her tits with both his hands. Strangely she stared at him like he had never done this before, but her body twitching and shivering from the pleasure already gave him the answer. Despite her incredible sensitive spots, the poor girl had a tough time cuming. But once again this was a challenge John would accept gladly. And speaking of challenges: he quickly opened his pants and let his dick roam free, before the lack of space around his rapidly hardening member became too uncomfortable. Her eyes greedily focused on his boner when it came to it's final parking position around the height of his chest, and drool dripped from her mouth. Probably she was remembering what they had done just a few minutes ago.
"Want me to shove that thing between your tits? Then you can lick on it." he offered, and Bessi nodded. With a sly grin John mounted her, knelt down about where her belly was, yet he had enough meat to still squeeze his cock in between that incredible rack, and allow her to take the occasional lick on it.

"You like this?" he teased her, while he rubbed and squeezed her tits around his shaft, sending her brain into a different dimension with it. He just knew how to please her by now.
"Oh fuck yesssss!!" she moaned in return. Luckily their parents allowed all this, as the doctor had insisted that with such active libido and such troubles cuming someone had to take proper care of her. He intensified his work, but he knew it would still take a while to send her over the edge, which made it all so much sweeter to go wild on her humongous tits. The most difficult part at this time was to not cum before her, but luckily his recent orgasm was helping out. Eventually she licked precum from his tip though, and that somehow reignited her interest into his massive member. Bessi in that state was completely lost in her arousal, but John was used to it, and knew what she liked, so there was nothing she had to fear from him. She knew that, which in turn allowed her to get off as she deserved, without anyone taking advantage of her melted brain.
"Your dick is long enough so that I can give you a blow-job with this." she suddenly blurted out. John had grown accustomed to ignore her strange finger snapping by now, yet he still wondered why she was doing all that deep down. Or why she explicitly took his dick out of her mouth just to say that. Was this some kind of a fetish of stating the obvious? He had no idea. But when she wrapped her lips around his cock, all those thoughts vanished from his mind anyways.

"Oh fuck..." he moaned, when his sister drove wild on his dick. "Sis you gotaaa... be carefuuHHHH" he tried to warn her, but she literally blew his mind away. Having a 25 inch boner was difficult to keep in check on it's own, but having said dick sandwiched between gigantic titties, a girl sucking on the tip like there was no tomorrow, and the ambient sound of her moaning made it impossible to keep himself from cuming eventually. He had tried his best, but now the inevitable happened, and he shot his load right into her mouth. At least what was left inside his balls.

"Sis, I told you to be careful." he panted "Not everyone takes as long to cum as you do." He had to take a break for a moment to come back down to earth, while his dick rapidly lost it's rigid state, after cuming twice in less than 30 minutes now.
"Noooo!" Bessi protested, but there was nothing John could do.
"I gonna continue, just give me a moment to recover." He tried to calm her.
"But I want your cock where it was." she demanded, clearly not understanding the mechanics here.
"Well after you made me cum twice, that would require a miracle." he laughed, but prepared to keep going, so she could get her orgasm as well. Yet briefly he was confused by her almost insane grin forming on her face.
"You stay hard." she said and snapped her fingers once more, sending John into yet another series of puzzling thoughts about why she had to comment on his perpetual boner.
"Yeah, I know." he responded, while he stared at this throbbing erection. That thing hadn't been down for years now. His doctor once joked that at his size all that blood had to decide whether it would stay inside his dick or not, and lucky for him it stayed. While that gave him this permanent erection, the alternative of never having sex was definitely worse. His sister seemed to agree, because she kept sucking on his cock like it was the sweetest lolipop.
"Fuck... sis don't make me cum a third time before I finish you!" he moaned, but she was obviously intent on winning this race...