The best of two worlds for this lucky actor: Mio's marvelous milky tits to suckle, and her giving him a decent hand job. Too bad she took such a small sample of his cum to taste.
I'm guessing it's no better or worse than milk flow by other women. Often, they have bigger nipples than Western women (Mio just has "normal" size nips; not so for her tits, however). Heavenly!