You knew this was coming!

Now that the season's over and Tristan Thompson's on break from the Cleveland Cavaliers, he's "home" with Khloe Kardashian in LA ... but a source tells us this isn't temporary. Tristan plans to live with Khloe until training begins for the season that starts in October. So he'll be in her Calabasas casa all summer is what we're told!

A source tells us: "Khloe's been putting in the time all season, flying out to Cleveland every week to see her man so now he's giving back -- staying with her in LA all summer so they don't have to travel to see each other. They both thought this would be a good test to see if their relationship works when they're together 24/7."

Will we see a ring put on Khloe's finger during this time? We'd put money on it!