A Sudden Truth

"I really would love to have a huge dick." John said. Instantly there was silence, and his mom stared at him. "I..I d-don't know why I just said that." he stammered. Bessie snickered, his mom slowly begun to file this under 'strange teenager behavior' even though John was already past that. They continued breakfast in silence, after which John withdraw to his room to play some games. But before he could even start anything his sister entered his room.

"You really want that?" she asked.
"What?" he wondered, and eyed her cocky posture confused.
"A huge dick?" she reminded him of earlier, and John's face immediately changed color.
"Sorry... I really don't know why that came out of me." he excused himself.
"No need to excuse yourself, just be honest with me." she interrupted him and snapped her fingers. John was a bit confused by her behavior, but decided to just be honest for now.
"Yeah I do." he admitted "I guess most guys do, but for me that's really like a wet dream to be huge down there." It felt awkward to be that open with his sister, but when he finally got if off his chest he at least felt somewhat relieved. Her smirk grew to a full grin, and for some reason she stepped into his room fully and closed the door behind her.
"Then I first have to see it." she giggled and added "You have no issues showing me your dick." followed by another snap.
John had no idea why she kept snapping her fingers, but of course he had no issues showing her his dick. That was normal... right? He pulled down his pants and boxers, till his soft member was on full display.
"Well I would have to see it hard, of course." Bessie chirped and showed an odd interest into his cock, which a sister shouldn't have.
"Uh..." John started, but once more Bessi interrupted him.
"You have no issue being hard when I am around." she kept doing this strange speech again "Or masturbating, or... in fact everything involving your cock and me always feel completely normal and fine." A snap of her fingers kept John on the edge. Of course he had no issues with anything involving his dick, but the way she pointed these things out felt strange.

"Why you keep snapping your fingers?" he wondered as he reached down to his member to get it as hard as she had asked him.
"Don't worry about that." she responded and snapped her fingers once more. John figured it was just some new TikTok thing or something, and decided to focus on getting that thing up. While he didn't mind her being around while he did that, it also wasn't especially arousing to him either, so he decided to close his eyes and think about his favorite porn, which included a lot of people with exaggerated body parts. Moments later he sported a full grown erection, bobbing under his slow movements.
"Soo... how big do you want to be? Like 8 inches?" she wondered. John felt a bit awkward again, but then if it involved his dick and his sister there was no tabu and no secrets.
"I am more into super huge." he explained "I just love massive endowments."
"So like... ten" she wondered, but John just laughed.
"More like 20." he grinned and gave his dick a few more pumps. Bessi seemed to get excited by this talk as well, John was pretty sure he saw her rock hard nipples making dents in her shirt.
"Ok then your dick is... 20 inches long." she said and snapped her fingers once more.
"Yeah... I know." John laughed and run his hand up and down on his full shaft to emphasize it. The head of his cock bobbing at the height of his chest made it easy for him to blow himself, and as it was nothing particularly special when his sister was around, he gave it a lick or two. She seemed to get overly excited by his member though, which was of course also completely normal, after all he had a fucking huge dick, and that was the common response he got.

"Isn't that like.. too big?" she said, panting slightly, but John laughed again.
"Nah, I love it." he said enjoying her greedy gaze on his member, like all the other girls. "It's long, but not too thick, so I can still fuck girls. Just obviously not getting in all of it, but that's fine."
"C-can I touch it?" she said, her voice trembling.
"Of course!" John reminded her "What kind of a question is that?" She was really acting strange today. So he let go of his shaft, it bounced for a moment, then he felt her hands carefully wrapping around it, like she had never done this before. With big eyes she started pumping that monster, looking up for confirmation every now and then, but of course John nodded at her to continue. Eventually she started to kiss the tip of it and even lick on it a bit.
"Usually girls take the tip into their mouth and use their tongue." he reminded her. Bessi hesitated for a moment, but then did as he suggested. "Oh yeah, that's good." he moaned. Eventually his sister remembered how to do this properly, like she had done so many times before, and John could finally enjoy her work full.
"If you keep doing that, you gonna make me cum." he warned her eventually, reminding her of the consequences of playing with his dick.