[Mosaic removed] Tsukasa's hobby is collecting underwear.I wore the collection and indulged in daydreams in front of the mirror.However, all of her favorite sexy underwear were stolen.Suspicious of her younger brother, Tsukasa sneaks a peek into his younger brother's room from the balcony.Then, the younger brother was masturbating using Tsukasa's underwear.The next day, I searched for my girlfriend's brother's room, but couldn't find it.I had no choice but to provoke her in my underwear and make her open her mouth.He was a younger brother who was reluctant to confess his feelings, but when he sexually accused him, he did.From that day on, she began to feel pleasure in dominating his younger brother and torturing him erotically.