The actual meaning of a pearly necklace has nothing to do with a tittie fuck. Its actually originates from a blow job. And after releasing your load into somebody's mouth. It runs out of the corner of the mouth and down the neck like a necklace. A tittie fuck is just a splat.
John shot his load into Janes mouth. And the hot sticky cum ran out of the corner of her mouth and down her neck like a pearl necklace.