When I was comforting my sister who had been dumped, I couldn't help but get an erection at her defenseless appearance! I was thinking about whether I could get an erection from my sister, but my sister said, "You got an erection from looking at me? I'm so happy! You like me too, brother? Let's have two children then," and devoured my erect penis. I thought it was bad, so I refused, but I was attacked in my sleep and forced to cum inside her. My sister went to school and spent the whole day with my sperm in her pussy, and even after I got home, she came to me.