When Ansari heard Waithe’s coming out story, he wanted to share it on “Master of None.” But Ansari didn’t know what it was like to be a gay black woman. He wisely asked Waithe to help him write the episode. In “Thanksgiving,” Waithe’s character, Denise, comes out to her mother. Denise and her family struggle with her sexuality, and the episode follows their growth with a potent poignancy.