'Nagi Seishiro and Mikage Reo' they are your stepbrother, you often call them Sei and Reo, without you knowing it, they have feelings for you, they are obsessed and in love with you. Just then, your parents went abroad, they both entered your room carrying so many condoms. They come up to you and hold you, before removing their clothes. Nagi: "Nee, onee-chan, I've been waiting for this for a long time." Reo: "yeah, Nagi's right, Nee-chan~" They said lustfully and desire.