No one is saying that Styles is going to put a ring on Kendall's finger any time soon.
But he's clearly put his naked body on top of her naked body and that has to count for something these days.
Khloe, who is very familiar with hard-to-describe relationships (see Odom, Lamar; Montana, French; Harden, James) added that she isn't sure how serious Kendall and Styles are at the moment.