Advice! New Betta & Tankmate!

So I just recently got a half-moon double-tail Betta. He's very pretty and I really like him. He is also my first fish. He's a very chill calm fish, I suppose. He doesn't move around a whole lot when I'm around. He likes to hide behind plants or the filter. Yesterday I got him a tankmate! I purchased a Dojo Loach to put in there with him. I'm not sure if this is normal or what this means, but my betta likes to sit on him? Like they're literally behind a plant and my betta just has popped a squat right ontop of him. I haven't seen any aggressive behavior towards him to my Dojo, actually this is the only contact I've seen from both of them. Last night I definitely noticed a change in my Betta, he has gotten more active, he would swim around I guess searching for his new friend? Once he found him and decided to chill out he would just lower himself ontop of him. My dojo isn't any fancy color, he's just a white one. Has anybody else tanked a Betta with a dojo? How did that turn out?