Liberi armati pericolosi (1976)

The blonde girl has a narrow waist and small tits, wearing a tight top that shows her shape. She’s in a parked car on the roadside with two slim guys in their 20s — one with dark hair takes off her pants while she leans forward, getting fucked hard from behind. Camera stays tight on her back and ass in doggy, clear view of the thrusting. Later scene shows her riding one of the same guys on a desk in what looks like an office, slow grinding with her shirt off. Guy in the background watches and jerks off, eventually swapping positions. Final outdoor shot shows the two dark-haired guys back in the car, windows fogged, one zipping up. No dialog, just natural lighting and medium close-ups throughout.