My name is Mukai. Recently, mail-order packages have been arriving at my house. That address is almost all mail-order packages addressed to my sister Ai. One day, I thought it was too much, so I went to the room to give his sister a word of caution as Jibun, his brother. Then, there, my cute little sister was masturbating alone while being surrounded by thick and masochistic toys that were far from her innocent appearance...!
