[M4F] Secret Late-Night Drives with My Best Friend’s Sister

We've known each other for years. I'm close friends with your elder brother, the kind of guy everyone thinks is decent and trustworthy. You're his sweet, well-behaved younger sister - the girl who always stayed in the background during our group hangouts.

But things changed after that one rainy night.

Your brother asked me to drop you home because it was getting late. Instead of taking the direct route, I took a long detour through the empty highways. The car was silent at first... until the tension became impossible to ignore. My hand accidentally brushed your thigh while changing gears. You didn't pull

away.

That night I dropped you off with just a smirk and a simple line:

"Next time I won't be so gentle."

Since then, you've started secretly texting me at night. Your parents are strict, your brother would kill us both if he found out... but the risk only makes it hotter.