Why is Kirk always the footstool in this relationship? And does he make a better footstool half-naked and whipped later on?

Why is Kirk always the footstool in this relationship? And does he make a better footstool half-naked and whipped later on?

# I personally think that they can both top and bottom each other For the tag.
I just simply can’t justify Spock as bottom. He’s more in character when he’s top. And Jim really looks like he wants to...
He really does. And Spock enjoys it more than I thought was allowed back in those days! Spock is just naturally...
I’d imagine it has something to do with the whole ‘pinned him to the bridge and strangled him’ thing. And I personally...
I can see Kirk as both bottom and top but I much prefer if he’s on top.
I feel like I kinda lean more towards bottom!Kirk but I can read and enjoy either.
I love all of you.
Maybe those that write more Bottom!Kirk since Reboot take from that choking scene and how aggressive and stronger Spock...