The Keeping Up with the Kardashians star took to Snapchat Sunday night to share several pictures and videos of her PDA-filled evening celebrating Halloween with her NBA star beau.
Kardashian, 32, and Thompson, 25, were dressed as Marvel Comics characters Storm and Black Panther.
In one video, Kardashian grinds on Thompson, and in the next, she has a friend film the two as they kiss and make out.
Kardashian, who recently finalized her divorce from ex-husband Lamar Odom, was first linked to Thompson in early September. In the weeks since, she’s spent much of her time with the Cleveland Cavaliers player, regularly flying out to support him and even flaunting his NBA championship ring on social media.
Last week, a source told PEOPLE the reality star is “very supportive of him, and they are getting serious.”
“They really dig each other a lot, and she’s planning to spend more and more time out there with him,” said the insider.
Keeping Up with the Kardashians airs Sundays (9 p.m. ET) on E!