Crossed ankles, with or without tied little toes (although the tied little toes idea sounds hot) would be great for a POV, slow, erotic, tickle-tease type of thing. The hot thing about the ankles-crossed position is that it allows unfettered access to tickling both arches at the same time. Stroking both of the arches of a girl in this position with all of the toes slowly straining, curling, spreading and wiggling would make for an extremely erotic foot tickling clip. What do you think, James Darke?