I thought my sister-in-law was super serious, modest and quiet, but ever since I saw her bring a guy over and give him a blowjob, I've started looking at her in a sexual way! I was excited watching my sister-in-law eat ice cream and imagining her face while she was giving me a blowjob, but before I knew it, I was making her suck my dick instead of the ice cream and giving her a blowjob! It felt so good that I came right away! I thought it was Ito and apologized, but instead of getting angry, my sister-in-law was a super slutty woman who asked me to continue, saying, "Do it harder!"