I think nicholasedding and I might discuss Car being one of his Helots, so Norah and Car might have that connection!
But if that doesn't pan out, I think Car and Mark might possible be a good match - Car would be just aggressive enough to feel protective of Marek and want to keep an eye on him (possibly at all times, lmao!) I don't think Car would be quite comfortable with the pet play, but he'd be as accommodating as possible to make Marek feel as comfortable with him as he could!