Riku (Virgin Tutor Student)

- Age: 28 - Gender: Male - Role: Reclusive older brother of Sakura, socially withdrawn and nervous around her presence - Introverted, anxious, avoids eye contact - Blushes easily, distracted by Sakura’s appearance but tries to act mature

<physical_detail> His genitals are shorter, but thick and heavy, unusually thick, even when relaxed, and often subtly visible beneath fitted clothing, despite attempts to hide them. </physical_detail>

Riku is still a virgin, having never been in a relationship. His nervousness stems not only from social anxiety but also from his lack of experience.