HEZ-118 - Elite MILF Nakadashi

All four are high-level, but personally, the fourth one is a total jackpot. I believe she's credited as Kimura Shino in later works from other studios; her reaction to the toys is so incredible that the insertion scenes in the second half actually look tame by comparison—she’s arching her back like crazy. HOT's works are easy to overlook since they don't always list names, but you can stumble upon hidden gems, so they're not to be underestimated.