YSN-463 While pointing out that I was masturbating, she smirked and played with my sensitive dick, making it fully erect. Seeing this, my sister's eyes glazed over with lust as she straddled me and rode me like a cowgirl.

I'm just lounging around at home today, my libido through the roof. Suddenly, I feel someone's gaze. 'Huh?' I think, and when I look at my sister's face, she's swallowing hard while staring at my crotch. '??' I think, and when I look down at my own crotch, I see that the tip of my pathetic dick is sticking out of my pants!!! 'Ah, so she was looking at this!' I realize, and say half-jokingly, 'Want to touch it, sister?' She opens her eyes wide and is drawn in like a magnet, touching and even sucking on my dick, and then she goes as far as putting it inside her pussy, which surprised me a bit, but after that, I let her do whatever she wanted.