Brother with a sister complex displays lewd thoughts and engages in sex education within the family. (Arisu Mai, KTRA-601)

I really want to have sex with my little sister...!! A brother with a sister complex is giving his sister sex education, but his ulterior motives are revealed!? The innocent little sister, Mai, follows her brother's instructions, caressing her body and playing with her hips... The brother shows his sister his erect penis, teaching her step-by-step how a male body works!! When her brother tells her, the serious Mai-chan begins to squeeze her erect penis...