Cuentos de las sábanas blancas (1977)

This one’s got a nice mix of outdoor and indoor scenes. Starts with a brunette girl, probably in her 20s, in a stone tub outside. Then cuts to a blonde girl with long hair standing by a bed indoors. There’s also two dudes, both older, with beards. One of them fucks the brunette girl doggy style in what looks like a castle hallway. The camera work’s decent, especially during the oral scenes. The girls are both slim, one with a bun, the other with long blonde hair. Not much in the way of special highlights, but it’s a solid watch if you’re into that sort of thing.