[My step-sister, born from my parents' remarriage, is the slut of urban legends!?] My step-father's daughter, Miru, is a slutty gal who catches guys on the street and has sex with them. She's extremely cheeky and makes fun of me, her older brother, calling me 'lame,' 'uncool,' and 'virgin-like.' But, as if something were to happen, I'm starting to enjoy being teased by her... One day, while I was masturbating in the living room with a porn magazine in hand, my sister caught me masturbating! She saw my erect penis. I thought, 'Oh no, she'll definitely make fun of me again...' but she gave me an unexpected response, saying, 'You have a pretty good penis when it's erect!' 'Is this your first time touching a penis...? Well, how about I take your virginity?' The story progresses smoothly, with teasing, nipple rubbing, and ejaculation countdowns, which are too stimulating for a virgin and a shocking first experience! From then on, we crossed the line and started having sex wherever we wanted... Morning wood blowjobs, secret sex in the kitchen, yukata sex after the festival. My devilish little sister will rape me at will, 24/7!