"Finally at liberty to reveal this pic of me on the #scandal set as 'Kinky Sue' with my true [love] @kerrywashington," 28-year-old Dunham wrote Thursday on Instagram, posting a snapshot of herself in character kissing
"I want to be like, a senator who did something wrong," Dunham previously said on Grantland's B.S. Report. "Playing a really evil character would be really fun."
In the upcoming episode, a woman -- presumably Sue -- threatens to expose sex secrets of some of the capital's most elite politicians, and Olivia is hired to defuse the situation.
ABC released a few photos of the highly shrouded show showing Dunham wearing a questionable brown wig and engaging with Olivia and Quinn (Katie Lowes) in the gladiator offices.
Incidentally, this won't be Dunham's first foray into ShondaLand. In March 2014, the author appeared in a "Scandal" sketch on "SNL" in which she played Pope & Associates' newest recruit -- a gladiator who asked way too many realistic questions.