PRED-883 When I allowed my brother-in-law to penetrate me with a promise of only 10 seconds, he was too much like me... I was so immoral tha

Natsuki lives with her stepbrother who attends cram school. Her brother, who has a crush on her, begs her for just 10 seconds of penetration... and to his surprise, it's a perfect match, sending her straight to orgasm! She knows it's wrong, but her hips and sexual desire are unstoppable, and they keep asking for more! Every chance they get, they keep going, 10 seconds... just 10 seconds more! The way the usually innocent Natsuki climaxes...