Looking for Story that was in Playboy

[Phaddy]

Sometime around the end of the 1960s, there was a story in playboy about a boy that graduates from college with a kind of girlfriend who comes home with him to live with his parents. There is some conflict with the father and the girl has a kind of breakdown. The boyfriend calms her down with food. She gains a lot of weight. The boyfriend splits and the girl stays living with the parents. They are part of an artistic social set and the girls gaining becomes part of the scene, with Warhol filming her eating and friends of the parents bringing treats for the girl to eat. Eventually, the responsibility of caring for the girl becomes overwhelming and the parents try to escape. Any ideas where that story could be found or who the writer was?