As a Submarine, getting together and having intercourse with a ship of another type, the RO-500 is nervous about being with a male for her first time. The I-401 also has sex with an RO-500 Female Type Submarine for the first time, and due to an excessively heightened desire to ejaculate he has moved past the skinship to insertion at a faster rate than usual. As soon as he starts making piston motions, he can no longer change position halfway through, and he ejaculates into the vagina of the RO-500 in the same position.