Awesome, hot stuff. I don't speak czech, but based on the expressions, type of characters and scene, I will take a shot at it:
The older woman has a crush on the younger one, probably her first girl-crush considering how clumsy she made her moves. The younger woman maybe just broke up with some tool, or several tools in a row, and maybe decided she may be open to sensual stuff with women. The older woman came on too strongly for her, so she freaked--but watch it again and consider this: She didn't resist the foot and leg tickling all that much and seemed to be enjoying it. If the older woman would've stayed there....hubba, hubba.....