You give in to temptation

By: Metaldreamer

"W-well, I can..." you trailed off as your hands slid over her thighs, converging on her musky member.

"Eh? O-oh! Ooooohhhhh..." Christy questions curiously before devolving into moans as you start to caress her member, coaxing it into life.

The girl tenses as you play with her, not sure how to react. You'd guess she has little to no experience in these matters having just had her 18th birthday, but the way she bites her lip to hold back another moan as you pick up speed, she is all for learning.

"W-wow, Doug..."

Grabbing the ruler, you falter as her penis rises... and rises... and surpasses her sister by quite a margin.

She was most definitely a grower, as while flaccid Christy's was only a few inches in size, completely erect it was a shocking 17 inches long and 4 inches thick.

You let the ruler fall to the ground as you look up, meeting her lustful eyes. "Definitely bigger..."

"Ha!" She smiles, face red as her member pulses with desire. "Thanks for the help!"

Her excitement dies down a little. "But... can you help me get it soft again?"

The fact that she was your girlfriend's little sister should have stopped you, not convinced you to help her achieve release.

And yet, you spit in your hands and resuming you ministrations, kissing and licking the tip before engulfing it in you mouth.

You were bobbing your head up and down her meatpole, trying to take in as much as you could; your hands alternating between massaging the rest of her length and playing with her sloshing balls.

Christy was holding your head, moaning and gasping at the greatest pleasure she had ever felt.

It didn't take long for her to reach her limit.

She exploded, filling your mouth with thick, virile cum; even swallowing until you almost choked was not enough to prevent seed from escaping through your lips and splashing against her hips and thighs.

Coughing, you released her cock as the stream subsided, clearing your throat from her creamy load bofore looking at the girl as she slid down the wall, butt hitting the ground as she stared at nothing, lost in her first post orgasmic haze.