Madeline, an 18 year old who finds out her brother likes ENF porn

(This is not the first time I've toyed with this trope, but I'd like to do it again.)

Madeline was bored one day, so she decided to be difficult and barge into her brother's room - he never did lock his doors! Much to her surprise and amusement, she found him jerking off.

"Ooooh," she trailed on, looking at his computer. It was set to enf-cmnf.cc, and the video was about a Spanish woman made to get naked on a game show.

"E N F?" she asked "what does that stand for?"

"Uh, uh..." he tried to explain, but she found out soon enough by looking at the page.

"Embarrassed naked females? Why would you be embarrassed about being naked, especially if you're a girl?"

"Uh, I mean..." he tried, still stuttering with your dick in your hands.

"I mean, she's on a game show, too!" Madeline continued with a chuckle, "I reckon I could turn heads in public, now that I think about it.

You really think it's embarrassing for a girl to be naked?" she scoffed as she started taking her shirt off, her brother panicking and hurriedly stuffing his half-chub back into his trousers.

"Please don't do that," he begged mumblingly.

But Madeline did do that. Undeterred, and unbra-ed, she slipped her shirt off and pulled down her shorts and panties in one fell swoop, standing there in her birthday suit with her arms akimbo.

"What's the matter, a little embarrassed?" she mocked her brother, who gave her a thousand-yard stare. She turned her eye to his window, which was on the ground level and opened to the front yard. Walking over, she pulled the curtains open and pulled the window open, tsk-tsking her brother for leaving that unlocked, too. Soon enough she stepped one foot at a time over and out of the window and started walking across the front yard to the sidewalk.

"Maddie!" her brother rushed to the window and tried to bark with whatever faux-anger and faux-authority he could muster, "Get back here!"

Madeline just stopped, looked back, smirked, and continued on her way as her brother rushed to collect her belongings.