SONE-381 I’m a girl in my 30s who was made to cum so embarrassingly by my sister’s young boyfriend

Minami Kojima's last work after graduating from S1, her first exclusive work will be released on March 19, 2014. I have nothing but gratitude for Kojima Mina, who has been working with me as an exclusive S1 member for 10 years. Thank you for coming to S1 and walking with me for 10 years. And Minami Kojima [New Chapter] I'll always be watching over you. ------------ I'm in my 30s and my sister's boyfriend (younger) makes me cum so embarrassingly. I don't have a boyfriend, I'm frustrated... I eavesdrop on my sister's couple having sex and masturbate, and the emptiness is so great. He sees through my embarrassing act and has sex with my sister's boyfriend out of pity... I'm frustrated... I'm pathetic... I'm embarrassed... but it felt good. I don't want to betray my sister, but I can't resist my carnal desire... Sex with my younger boyfriend was exciting, but I can't keep doing this forever... So on that night when my sister was away, I decided to let him hold me with all my might one last time...