Okay I know everyone seems to champion (haha unintentional pun) dom Shiro and it makes sense when he had the gladiator mentality but like sub Shiro is a good headcanon too in my opinion. Especially since Shiro has control issues it'd be the ultimate sign of trust for him. Leader who has that one person they kneel to? Sign me the hell up.
God yes, sub Shiro is so….so…*proceeds to puddle on the floor*…unf