That looks like one of Prime's old pay-for-play sets. He called sites that let you ask the models to do things for you, and asked them to tickle each other. He had hundreds of pics, that were, and maybe still are, posted on Yahoo groups. He very generously shared them with everybody. Some are real classics.
Cool, thank you. Shame he's gone, that sounds like it'd have been a great time. Kind of like the whole webcam girls (though hopefully it was cheaper, and clearly with more attractive models [or atleast the models I'm seeing recently])