YSN-427 It seems like my serious sister finally got her first boyfriend. Since she has little experience, she's quite interested in H stuff and started asking me questions about it. Then her eyes suddenly changed, and she began staring at my crotch. I let

My sister, who is innocent and serious about such things, was in a good mood today. So I asked her, 'Has something good happened?' Apparently, she got her first boyfriend. She started asking me all sorts of questions about sex, so I just brushed them off casually. But then my sister's eyes changed, and she started drooling while staring at my crotch. Before I knew it, she was mimicking the motion and putting it in her mouth. So I just went along with it for a while.