Random (kinky) headcanons:
BDSM has come up as one of the if not The most popular kink in both the US and Canada.
My headcanon in general is that Matt is a service top while Al is a power bottom. Along this lines, I think Matt tends to dom while Alfred prefers to sub, ESPECIALLY if they are with each other.
Why?
I think Alfred desperately needs a place/time when he's not in control. He's so powerful and dominant in the world - I know some people like to interpret this as how he would be in bed too but I personally headcanon that in private he needs a reprieve. He needs to let someone else be responsible and take care of him. He also may like the feeling of belonging to someone but in a way that doesn't impinge on his ACTUAL freedom in any way.
However, (outside of AU at least) it would be very difficult for him to hand over the reigns to most partners in a BDSM situation, especially one where he was to genuinely trust the person and not just play act. Subbing is not the same as bottoming. He can bottom and be in full control, but subbing is about relinquishing that control for a time. Though he is a bit of a bratty sub!
For Matthew, he often isn't in control of much worldwide. He's his own nation now, but still a part of the Commonwealth and very tied to US policies. He doesn't have near the international presence and influence that the US wields. Matthew is very responsive, and in sex, that means he's very eager to please his partner and to give them what they need and if that's for him to take control, he's willing and capable. While he might not seek the initiative all on his own, I think he very much enjoys it and benefits from it as well. And Matthew is a very GOOD Dom. He can adjust hard or soft as needed and he excels at aftercare.
In terms of CanAme , I do see the two as most likely to indulge in BDSM with each other rather than any other pairing. Matthew I think less so, as he's more comfortable with power dynamics while, as I mentioned, I think Alfred has a very short list of those he would be willing to engage with. My personal headcanon is that it's a very, very short list (and in a CanAme verse may well be only Mattie). Alfred would also be more likely to keep this sort of a relationship very private. While again Matthew would be more liberal with this, if it's CanAme, he also keeps it very private - in part out of respect for Alfred and in part because he can get very possessive/protective of his Alfie.













