Cross-breeding mechsplo with Power Rangers style combiners and giving each team member a specific use/degradation kink based on which particular part of the combined robot's body their mech becomes.
Ok ha ha yeah legs/feet ha ha head ha ha torso WHO IS GETTING SEXUAL ABOUT SPECIFICALLY ONLY THEIR LEFT ARM??
There are a couple of perspectives we can come at this question from:
It's not necessarily getting kinky about being an arm. Use kink is, broadly speaking, a subgenre of objectification kink which explores the intersection of function and form. What is the "purpose" of an arm? What would it mean to be used in the manner of one?
The lesbian hand fetishists would like a word.
The left arm holds the shield, traditionally. This has very clean mapping onto self destructive and submissive kinks- the shield serves and earns honor by being hit.
