There's never a dull moment when it comes to Kylie Jenner's Snapchat.

The 18-year-old recently posted a video of herself getting ready to (jokingly?) kiss her sister Kendall Jenner, when all of a sudden the 20-year-old sticks her tongue out and it lands right in Kylie's mouth. The video is captioned, "She sucked my tongue… I'm dead."

RELATED: Kylie Jenner Gets a New Tattoo — See Which Intimate Spot Got Inked!

This isn't the first time the girls have made headlines together for being overly close. Click through the gallery to see more of their most scandalous moments.