I thought I was going to play SM with my serious childhood friend, but I realized that I had a serious masturbation habit and turned into a sensitive masochist pet.

My childhood friend, Marasu-onee-san, who is one year older than me, had excellent grades and often went to my house to learn from me. When I told him that I had recently become interested in SM play, would I give it a try? That's it. Yay! First, let's play bondage with cotton rope. If you fix it in an embarrassing manner, you'll already have stains on your pants... The naughty liquid overflows more and more when I brush it. I was getting excited too, so I couldn't help but stick my dick in her mouth! Is this what deep throat is? It looks really painful! I can't stand it! It's like my sister isn't completely alone either. Is this masochistic awakening? I might be talented. ...I decided to train her as a masochist.