GVH-628 我的女朋友的妹妹绫香是[女性射精课程]的技术讲师，她突然让我当男模特，然后用惊人的技巧玩弄着我被蒙住眼睛的阴茎，结果我好几次都没能射出来。这……

Her older sister Ayaka’s job, which was kept a secret, was as a technical instructor for AV actresses and sex workers! And when I came to help with the job, I ended up filling in for the male model because he couldn’t come! Covered by a sheet and with only my dick sticking out, I couldn’t help but ejaculate wildly due to Ayaka-san’s amazing techniques! Furthermore, the students play with their dicks after ejaculating and they faint in agony! Even though it was a lecture, I ended up failing to ejaculate prematurely. #Team Leader P