Two uniformed schoolgirls, bored on an empty bus, decide to pass the time with a naughty game. They strip off their tops, revealing their perky, young breasts, and start rubbing them together, moaning softly. One girl leans over and takes the other's nipple into her mouth, sucking and licking, while the other arches her back, enjoying the sensation. They take turns feeling each other's tits, their hands exploring every curve and contour. The game heats up as they start to rub their breasts together harder, their nipples erect and sensitive. They're so lost in their pleasure that they don't notice the bus driver watching them in the mirror, stroking his cock under his uniform.