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Watch What Happens When Mom Walks In On Her Teen Bodybuilder Son Flexing In A Thong

19-year-old YouTube bodybuilder, Kieran “Flex” Billen, loves showing off his incredible physique to his millions of anonymous YouTube viewers.

The London teen was in the middle of filming a new “flex” video when his ‘mum’ barged into his room, catching her son flexing in a thong with the camera rolling.

Watch what happened next below:

Here are a few more videos of Kieran to whet your appetite:

Someone please tell him to flex naked in his next video:

What do you think?