Blowing off some steam

Mark looked at Jill feeling of her body and felt a stirring within his loins. Oh he definitely perused some incestuous stories and comics before, but his little sister had always been kind of flat and unattractive to him before right now. With the new curvy body and her perverted attitude she suddenly went from being a 3 to being a full 10 on his scale of attraction.

He felt his pants tenting his heart quickening and his morbid curiosity rising to the surface.

While Jill was still preoccupied it was time to add another line. He already knew that she was just as perverted as him so was just a matter of tweaking preferences just a little bit.

Jill eagerly accepts any and all sexual advances especially from family members and will actively encourage incest.

Mark was a virgin and right now his throbbing cock was screaming at him that there was a willing and curvy recipient right in front of him.

He got up from his chair moving behind his sister and wrapping his arms around her that his throbbing erection rubbed against her supple rear as he leaned in to inhale her scent.

For a moment Jill giggled with surprise then she leaned back rubbing her thick thighs against his throbbing erection.

'Damn big bro, it wasn't enough for you just to look at the goods you had to want to sample them yourself," she purred her new kinks turning what should have been an unwanted advance into the most erotic experience of her young life.

The curvy teenager gently grabbed her brother's hands encouraging him to feel up her rack moaning gently.

"I know you just messed with my mind, but you better not stop until I'm full of your cum," she groaned.

The perverted vixen reluctantly pulled away turning to face her brother and gently pulling him into an embrace. The lonely pervert felt her lips on his seconds before her tongue invaded his mouth and everything else in the world seemed to fade away. Unlike her he hadn't done much alteration to his body he was still little out of shape but is 12 inch erection was already straining hard throbbing as their tongues darted into each other's mouth. He had created the perfect partner in crime and after about a minute of making out he was very glad he had only added a fetish.

Jill pulled back panting a long strand of saliva running down onto her sumptuous cleavage.

"

You're not a bad kisser Big Brother, but I think we can do better," she growled her hand gently stroking his massive member through his pants. Even though he had just spattered semen all over a bunch of tissues he was already rockhard again.

I think I want this in my mouth first," she whispered in his ear her scent intoxicating him,

"Then in my pussy, then I want you to make sure you do my ass as well," she growled, every word made him somehow harder.

Like a sultry succubus Jill withdrew just far enough out of her brothers embrace she quickly peel off her poor abused baby doll T-shirt and straining skinny jeans. Once the button was free her pants almost popped off leaving her topless in front of him.

Mark took in the sight silently unaware of just how much other firecracker he had created his perverted sister was going to be a handful well at least two handfuls. She smirked at him satisfied it is reaction before sauntering back gently tugging at his waist band until his pants were on his knees and his thick throbbing erection was rubbing against her belly.

"You better get started then, show me how much of a man you are," she groaned gently pushing him back into his computer chair she knelt before him. Mark groaned as he felt his sister's lips wrapping around his shaft she was perfect well almost perfect, her previous waifish complexion was still there in other places maybe he could help her out if he could type one-handed.