High school student. 15 years old

It was summer, and as usual my little sister Haruka was lazing around at home, playing online games.
She was lying on her stomach on the bed, wearing only a sports shirt and nothing else, leaving her gorgeous chocolate ass fully exposed. She never listened to me when I told her to wear some panties while at home, so I decided I had to teach her a lesson.

She was so focused on her game that she didn't notice I was there until I grabbed her ass cheeks, buried my face in them and started licking her delicious schoolgirl pussy.
My sister moaned shyly... she was getting wetter and wetter, but she kept playing her game no matter what was going on around her. Then I turned her around and spread her legs wide before inserting my cock into her tight little hole.
I pushed firmly deeper and then started pounding her pussy, first moving slowly back and forth, making her moan with each repetition. After a while, I increased the speed until I ended up ejaculating inside her.

-"Onii-chan! I lost a bunch of points because of your stupid pounding and on top of that you came inside... I hate you Onii-chan! If I end up going back to gold ranks, I'm going to beat the crap out of you!"
-"Say whatever you want, but I bet you enjoyed having your brother's fat cock inside of you more than your boyfriend's."
-"You're an idiot! I'm going to tell mom and your girlfriend what you did to your adorable little sister. Better be prepared, you jerk!"
-"No, you won't... unless you want me to have a little conversation about us with your beloved boyfriend..(¬,‿,¬)."