When a woman puts a lollipop or a dumdum in her pussy, swirls it around, most likely wraps it back up in plastic and gives it or sends it to someone else.
Often done by porn stars, web camera girls and such.
When a male rubs the head of his penis around the exterior of a moist vagina then has the girl suck the juices of the head of his penis, simulating a vagina flavored sucker.