He probably prays before you guys have smex. I don't know he's just built different.
There are practically no times where he is top/dom because you won't let him. The only way is if you "reward" him by, you know 😉.
However, since you know what he does to is siblings, it makes it real hard for him to get his "reward".Keeps a straight face but eventually fails.
If you guys have headcannons write them down in the comments 😊.
Also.....Happy Birthday Hakkai(Though its really delayed)