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Summary
At the start of their, for lack of a better word, hookups, Callisto had always latched on his prosthetics himself, for he knows his own body best. Hohenheim had looked on with a faux mild detachment, but it is impossible for a man of science to hide his intrinsic curiosity towards engineering. They had spent a whole night once talking through the purpose of the machinery underneath their cosmetic cover, with a hands-on session to practice what Hohenheim has learnt. Now, it is Hohenheim's assigned duty during their trysts to bind his choice of genitalia to Callisto while the man sits pinion, observing him with the same fond pride a master would their protégé.
A one-night stand becomes weekly hookups becomes a connection too complicated to name. They fuck about it.