MIDA-368 _The neighbor's revealing underwear

Rena is Yuki's younger sister. She's a year younger than Yuki and they've been together since they were little. Rena's hobby is reading manga, so every time there's a new episode, she goes to Yuki's house to borrow it after school. There wouldn't be anything worth mentioning if Rena would dress a little more discreetly. Instead, she just wore a short skirt and lay on the bed reading a story, her panties just caught Yuki's eye, making him unable to help but peek. Yuki is in puberty so every time he sees that scene he becomes unbearably horny. He just hopes Rena will come home soon so he can pull out his cock, imagining fucking her and turning his hand. Yuki masturbates so much that he doesn't have time to read manga, but that still doesn't satisfy his young cock. Is it possible that Rena is intentionally making Yuki become like that?