Low-speed riding position with teasing and thrusting before ejaculation, followed by high-speed thrusting and ejaculation in a variable-speed riding position. (Fujimori Riho, DVAJ-518)

The nymphomaniac genius Fujimori Riho teases the man in a slow, riding position just before he's about to ejaculate, then lets his penis rest for a while before unleashing super-fast thrusting, causing him to ejaculate repeatedly!