And he's just getting started!
Get the rundown (below):
The results? A routine that puts all of our childhood secret handshakes to shame.
In the, um, inneresting clips K&K stick out their tounges, clap hands, and go in for a kiss.
The 20-year-old supermodel posted one vid of the sisterly love on Instagram:
unrehearsed. no no @kyliejennerA video posted by Kendall Jenner (@kendalljenner) on Jan 5, 2016 at 1:07am PST
The rest of the scenario — boob grabbing and twerking galore — was captured on Kylie's Snapchat (duh):
A video posted by Kylie Jenner Snapchats (@kylizzlesnapchats) on Jan 5, 2016 at 4:07am PST
A photo posted by King Kylie (@kyliejenner) on Jan 5, 2016 at 11:52am PST
A photo posted by King Kylie (@kyliejenner) on Jan 5, 2016 at 12:42pm PST
Sometimes you just gotta let loose on a Monday, ya know?
[Image via Instagram.]