Chief slowly teaching Doomguy to relax in his presence, whether that's fetching something Chief can tell he's craving, ushering him into bed for a nap (Doomguy never really sleeps), or just walking around aimlessly with him when the sky glows yellow.
I think Chief would be helpful in quelling that constant hatred in Doom's head.
Having his back to Chief's chest when they're spooning, or seeing him finally brave enough to kneel between his legs and submit
















