[後藤寿庵] 先生教えてっ!! (コミック・マショウ 2013年3月号) [英訳]
#89455 - After about five minutes when he had my cock in his mouth I heard my door open, and there was my sister standing in the door watching her little brother getting a blowjob from his cousin, and to make it worse we were both wearing her underwear. She kept sucking until she got every last drop out of me, and swallowed every bit of it. I told her I thought about her all the time, and how I knew I shouldn't but I couldn't help it.