No

You got up and left your room, heading to the bathroom. There you took a piss and took the opportunity to clean up the spatter of your cum that was drying on you.

On the way back to your room, you heard a sound of something moving and a little wheezing. Looking to see where it was coming from, you noticed that Kim's bedroom door was ajar and there was some light source on there.

Curious, you peeked in the opening and saw Kim sitting on her bed, lit by the light from the lamp on her headboard, and she was stroking her own hard cock.

"Hold on, wasn't her having a dick just a dream? Or is it that... now that I think about it, the clothes she wears and the attitude at certain times now make sense. Unconsciously I must have been suspicious, that's why I had that dream." you thought

Returning to pay attention to Kim, you realized that your dream had the wrong size of her dick, because the real life one is bigger. The monster between his sister's legs was like 20 inches and her balls were the size of avocados.

You just stood there and watched as Kim stopped jerking off and, showing great elasticity in her body, she arched and placed her cock in her own mouth. She was probably already used to doing this, easily arching herself further as she pushed her cock deeper and deeper until she was resting her nose on her own balls.

Watching Kim's autofellatio session was very exciting and you felt your cock get hard in your pants again. As she sucked herself she had the fingers of one hand thrust into her own pussy.

Kim's moans were totally muffled by her full mouth and you kept quiet as much as possible so she wouldn't realize you were eavesdropping.

In yet another exciting sight you saw Kim come, stopping with her cock fully inside her mouth and depositing her cum directly in her stomach.

After her orgasm Kim let it all out, with one last bit of her cum connecting the tip of her cock to her mouth before she wiped it off with her tongue. She felt a sense of satisfaction as she leaned into her arms as her cock softened.