Tag der Idioten (1981)

Starts with this slim brunette in a schoolgirl outfit — knee-high socks, plaid skirt, the whole deal — kneeling in an office and sucking dick like she’s starving. The guy’s just sitting there in glasses, looking all professional while she goes to town. Camera gets right in there, so you see every sloppy lick and gag. Later, same girl’s tied up in some shadowy dungeon room, arms behind her back, tits out, looking all helpless. She’s touching herself while the chains rattle, and the lighting’s dim but you can still see everything. Another scene has her in a shower, blonde hair wet, mouth open, going down on someone off-camera. Feels like a mix of power play and just straight-up horny moments.