Vintage Swedish Bondage
It’s the sloppy bondage typical of vintage bondage porn made by non-fetishists, but the girl on the left who is helping to tie surely has a sweet smile:
From a magazine called Billed Magasinet Nr. 1. Elsewhere in the same magazine:
Hard to tell if the girl in the second photo is supposed to be screaming in fear or giggling from being tickled. Personally I prefer to think she’s giggling but given that era I would bet that wasn’t the story line.
I think it possible that the girl in the second photo is experiencing a degree of hysteria. She might be conflicted between her hidden lustful desires being suddenly and publicly acted on, and her subconscious sense that decorum requires a degree of resistance on her part.
I think the two ladies were caught swimming or sunbathing in the nude, and were quickly hustled to the tree trunk by men whom they know and are friends with.