TikTok user catches boyfriend cheating with his stepsister
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Woman catches boyfriend having sex with his stepsister: ‘She was on top’

Talk about keeping it in the family — yikes!

A scorned woman is going viral for unabashedly blasting a former boyfriend for cheating on her with his high school-age stepsister. 

“My ex’s stepsister sent me a SnapChat video of the two of them, both completely naked, and she was on top of him,” Courtney Copenhagen, 18, told The Post, adding that her old flame and his sis have been siblings-by-marriage for over eight years. 

“As soon as I saw the video I started crying, and my first thought was ‘What the f–k?,’ ” she said. 

Copenhagen, a freshman at Michigan Technological University, originally detailed the disturbing incident in a now-trending TikTok tell-all

A Michigan Technological University student has gone viral on TikTok for blasting her ex-boyfriend for cheating on her with his stepsister. NYPost Composite

“I never saw your stepsister as a threat,” she penned in the closed captions of her viral video — which is set to Ed Sheeran’s scolding smash hit “Don’t,” and has fetched a whopping 6.5 million views. “Until she sent me a video of you two having sex of course.”

The flabbergasted biomedical engineering student went on to explain that she’d met her ex, a Michigan Tech sophomore named Mitchell, during her first semester of college, and had been out to lunch with his mother when she learned of his incestuous infidelity. 

@theshortdumbass

i hope you see this Mitchell😚

♬ that ed sheeran song – Adam Watt

“I was going out to lunch with his mom because it was her birthday and I wanted to celebrate it with her,” said Copenhagen. “And that’s when the stepsister (a high school student named Ashley) sent me the SnapChat.”

In a follow-up TikTok post, the co-ed confessed that she shared the cringe-worthy clip with Mitchell’s mother during their luncheon because “I was in shock and I didn’t know what to do.” She claims that her ex’s mom “was even more in shock” at the unseemly scene, and ultimately left the restaurant. 

Copenhagen showed her ex-boyfriend’s mom the NSFW video of him having sex with his younger stepsister while they were out to lunch, celebrating her birthday. TikTok/@theshortdumbass

“His mom just looked at me and said, ‘I need to leave,’ ” Copenhagen explained. “I’m assuming she went home to confront her kids about it.”

But before she had the chance to question Mitchell about fooling around with his family member, Copenhagen discovered that she’d been barred from contacting him via phone and on social media. 

“I was expecting to call him when I got back to my dorm,” she said. “But once I got back to my room I found out I was blocked on everything with him.”

@theshortdumbass

Reply to @theshortdumbass i hope this clears up some questions

♬ original sound – Courtney Copenhagen

And Copenhagen, who never dreamed that her posts would go viral, claims that she shared the stomach-churning story online as a means of coping with the situation. 

“I wasn’t expecting to get so many views and likes. It’s kind of overwhelming,” she said. “I’ve just always posted videos as a way to deal with the different things that happen in my life.”

On TikTok, she also shared a screenshot of an outraged Ashley’s angry text message rebuke, bawling her out for airing out their dirty laundry online. 

“This is Ashley. What the actual f–k is wrong with you? You made a TikTok about my brother and I and you used his name?! Our friends and family members saw it and now we’re getting s—-ed on for it! You’re a piece of s–t like how f—ed up can you be? Karma is going to be a real b—h to you…,” read the scathing correspondence. 

Copenhagen says she “dodged a bullet” after discovering her ex-boyfriend’s sexual relationship with his stepsister. TikTok/@theshortdumbass

Sympathetic TikTok watchers flooded Copenhagen’s comment section with well wishes and words of comfort. 

But the resilient single lady quickly assured her cyber supporters that their pity was totally unnecessary. 

“Everyone who’s apologizing, please don’t,” she insisted. “I’m glad I dodged that bullet. I was a freshman in college who was going to fall in love with the first person she laid eyes on. And the guy I fall in love with just so happens to be someone who f–ks their sister. So, I’m OK!”

And while this situation hasn’t totally ruined Copenhagen’s desire for romance, the busy scholar says she’s temporarily placing her love life on hold because “I don’t have time for the drama.”