Snack means a threesome

Three friends come together to enjoy their tea and cakes. In fact it's a sexy chick and her boyfriend who invite their mutual female friend to share meals. Somewhere in the middle of the dinner it turns out that friend teases the dude under the table with her gentle toes. Little by little the hostess of the house gets angry because she does not want anybody else to fool around with her boyfriend. Luckily she turns out too sex-hungry to avoid the quarrel and to turn the three friends meeting into a wild threesome sex scene.