They've got this co-parenting thing down.

Scott Disick took eldest son Mason to lunch in Calabasas yesterday, just hours before the Keeping Up with the Kardashians episode aired, in which he comes clean about seriously dating Sofia Richie.

Kris Jenner grilled him about his teen girlfriend in one scene, but LD kept the details mostly to himself to protect Kourtney Kardashian's feelings.

"Kris really is like my mom to me, so I don’t ever feel like she’s putting me on the spot. But I don’t really feel comfortable talking to her about my personal or dating life. For me, to see that Kris is invested in my life means the world to me. Because she’s got so many other kids and so many other things going on, so the fact that she actually worries, loves and cares about me is probably one of the best feelings I have,” he said during a confessional.

“Truthfully, as much as I’d like to be honest with her and tell her how I’m how I’m really feeling, I also do want to respect Kourtney and her feelings. Maybe down the line, but right now, my biggest thing is just being respectful of everybody," he added.

The Lord seems like he's really matured in the past few months!