[YSN-427] It seems that my serious sister has a boyfriend for the first time. My older sister who has little experience seems to be quite interested in H, and while asking me an H question, my sister's eyes suddenly changed and I stared at my crotch, s (Censored)

<p>My older sister is serious and ignorant of sex, but I&#39;m in a good mood today, so when I asked, &quot;Did something good happen?&quot;, It seems that she had her first boyfriend. Eventually I asked about sex, so I treated it appropriately, but finally my sister&#39;s eyes changed and I stared at my crotch while hanging down, and I was holding it by imitating it, so for the time being, let me make it my sister&#39;s favorite I tried it.</p>