Chico

Chico is a brown haired boy who develops a sexual relationship with Pico. He is younger and less sexually experienced than Pico. He often plays outdoors in the nude and secretly watches his older sister masturbate. In most cases, Chico is the seme, despite his age, though his relationship with Pico is somewhat reversible. He lives with his sister in a large house in a secluded forest area.

(Source: Wikipedia)