breast challenge (Pixiv Fanbox)

동생이 뒤에서 검술 연습 중인데도, 너무 끈질기게 부탁 받았기에

弟が裏で剣術の練習をしているのに…しつこく頼まれたので

Even though her Younger brother was practicing swordsmanship behind her..

She was persistently asked to show her breasts.