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.
