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 That I Blew My Wits About Me. Natsuki Waka

【Forbidden sibling sex is too compatible, leading to endless orgasms...!】 Natsuki is an older sister living with her stepbrother who attends cram school. When he, harboring a crush on Natsuki, begs for 'just 10 seconds' of insertion... it's unexpectedly a perfect fit, and her pussy immediately climaxes! Even though she knows it's wrong... her hips and sexual desire won't stop, and they keep seeking each other out! Whenever there's a chance, they fuck for 10 seconds... then another 10 seconds! Natsuki, who was once pure, has such a great way of cumming that he ejaculates continuously! Their secret, intense creampies! They want to be filled by cock and pussy more and more... It felt so good it drove them out of their minds...