偏愛兄妹 妹に彼氏ができたとき　須崎美羽 (2021)

"The one who sees his real sister with sexual eyes is a strange guy," I thought so. Until my sister has a boyfriend ... I don't care what my sister is doing, but rather it's easier to have less conversation and contact. It was such a sense of distance from my sister. However, when I heard a phone call with my boyfriend or found a cute underwear that I had never had before, I noticed that different emotions were beginning to grow in me ...