Onna jigoku uta: Shakuhachi Benten (1970)

This one’s got an Asian girl with long black hair and a slim build. She’s got small tits, but her face is pretty. The scene starts with her in an intimate embrace with someone, possibly a girl, on a bed with blankets. The camera gets up close on her face, then shows her alone, looking down. The lighting’s dim, mostly low-key and medium shots. You see some close-ups of her face and what looks like oral sex going on. The girl’s got a small nose and looks like she’s in her 20s. Not much else happens, just her and the other person getting cozy.