Tagger by Amy Hamblen

A girl in a bikini top and cutoff jeans wearing sunglasses is gazing out the
window. A young guy in a polo shirt who has been sitting behind her has
carefully untied the string around her neck, without her noticing. He walks
past her seat and snags the suit right off her chest. Tagger races to the
scene, spray paints a brand new bikini on her chest, and the girl leans back in
her seat relieved.