ZMEN-059 Hallucination! - Delusion? - My younger sister, who I didn't think of as a female until now, suddenly grew cat ears...I'm a 2D lover, so I got so hard that it hurt!

One day, my sister suddenly grew cat ears. - Is this a hallucination caused by studying too hard for entrance exams? - Or has fantasy and reality become mixed up due to lack of masturbation? - In any case, my younger sister, who normally would never be considered a sexual object, seemed irresistibly cute...