I became small and was made a toy for gals - Aika

Aika is a gal who takes advantage of Nishi-kun, a 24-year-old man who has become tiny. She uses him as a toy and engages in various sexual activities with him, including oral sex and touching. The central kink of this movie is the shrinking fetish, where Nishi-kun's small size makes him vulnerable to Aika's desires.