Brody Jenner posted a graphic sexual joke about his teenage sister

Brody Jenner raised eyebrows earlier today when he posted – and then removed – a graphic sexual joke.

The most awkward part? The image involves his 17-year-old sister, Kylie, and most likely her 26-year-old rapper boyfriend, Tyga.

The picture, which appeared on his Instagram account for a couple of hours, boasted the caption, "just licking 4 my keys". It depicts a large tiger crouched over a naked woman who looks remarkably similar to Kylie, and who is arranged in a compromising position.

HollywoodLife.com is currently carrying a non-censored version of the shocking image.

Brody, 31, may have removed the post of his own accord, or it could have been taken down by Instagram for violation of user policy. It is also possible that his sister contacted Mr Jenner directly to ask him to delete the drawing.

Numerous fans expressed their shock upon seeing it, not least – as many pointed out – because of the stage-name of Ms Jenner's long-term boyfriend.

Certainly, few were in any doubt that this was an explicit – in every sense – reference to Kylie and Tyga's relationship.

Brody is known to be highly protective of his younger sisters Kendall, 19, and Kylie.

Filming for her family's reality TV show in Thailand last year, Kendall was groped by a stranger while standing at a bar with her brother. Although the man initially denied any wrongdoing, he was subsequently caught out by the Keeping Up With The Kardashians cameras. 

Brody was also quick to jump to her defence, asking: "Did you just f***ing touch my sister? Are you f***ing kidding me, bro?"