You proudly stand there holding your dick

You began shaking your dick, letting it harden while being able to pretend that you were merely getting rid of the last droplets of piss. By now, you were a semi-impressive 5 inches.

You glanced in the mirror. You looked pretty average, except for my cock which hung thick and limp between your powerful crosscountry legs. Even though you're more of a grower than a shower, the thought of your sister discovering you excited you. When it first started to grow it used to get in the way when you ran, bouncing with every step, and you had worried about people seeing the bulge it made. But you'd switched to wearing compression shorts to prevent any unfortunate accidents during school. While six and a half inches wasn't huge, it was more than enough to embarrass.

You felt pretty complacent about your dick as you nervously twitched, psyching up for your plan, instilling some confidence in yourself until you felt decent.

Sexy Mcstuffin had just entered the doorway, her eyes a bit bleary from just waking up. She hurriedly shut the door, muttering about how annoying it was that she couldn't use her normal bathroom and had to share with you. You decide to show off your dick even more by adjusting your stance so your pants which are halfway down (who cares about politeness when you just wake up) give a full view of your dick from the door. You shook your dick once more.

She gasped when she heard the sound of someone else being in the bathroom. You chuckled, "What was that about siblings?"

You suddenly recollected your rather naive and spark-of-the-moment plan. You were a bit annoyed with yourself for leaving the door open and forcing you to do this, but it's not like you could have pulled your pants up... Oh wait, you could have. Yeah you are a dumbass. Gritting your teeth, you decided to commit to it. After all, your sister was pretty hot.

Your heart froze when you heard her little gasp at your dick, making your dick stand at half-mast almost hitting six inches.

You slowly turned your head, pretending to be nonchalant.

It was Sexy Mcstuffin, wearing nothing but a pair of panties. You stared at her as she glanced down at her naked tits, blushing. She protested, "Why are you here!"

You retorted, "Why are you topless.?"

She stared at your cock, her eyes wide. She stood for a few seconds, just staring, not reacting at all.

You broke the silence.

"Uh...do you mind? I'm trying to piss, here."

She seemed to remember your previous question. She stammered, "Uhh... I just went to the bathroom down the hall."

You frowned. Your sister and you had very close bedrooms, but she had taken the nearest bathroom, forcing you to use the far away bathroom every morning.

You shook your cock slightly to indicate that she ought to leave.

Meeting your eye, she blushed and her hand covered her mouth in an almost lady-like manner. She quickly opened the door and scuttled back to her room.

You heard your sister's door open, then slam as well.

You let out a huge sigh and let go of your cock, stretching your arms up.

You'd done it! You weren't going to get screamed at for peeping on her or have to get pushed out of the bathroom. Also, you thought a bit hornily, you might've made your sister just a tiny bit wet. You had heard that her boyfriend Chuck had a tiny dick... Let's see her make fun of you now.

For once, you realized that you wished you had an even bigger dick, so you could really arouse her.

You thought about her cute blush, the panicked look as she fled away.

You remembered her long, smooth legs and her globes hanging off her chest, defying gravity. Those perky tits with two points proudly begging your attention.

Licking your lips, you wished for some early morning action before heading back to your room to take care of your little problem.