Pretend
They played pretend a lot. They didn't look into each other's eyes seeking truth undeniable, they just blended their bodies, their hoping into one entity and they pretended.
Kurogane pretended he didn't care about that blond wizard who would ride him. Who would impale himself heavily and skillfully, reaching his own pleasure with each thrust. He pretended he didn't care about the faint scars on the otherwise flawless skin. He didn't care about the tears that always poured when they were spent, lying close enough without really touching. Kurogane pretended he liked things that way.
Fai pretended that he did care. He knew, he could tell that Kurogane liked him a lot. But he didn't return the feelings. He couldn't. He had loved once and now he was traveling through worlds to escape that love. He knew what he wanted and how to get it, whether his partner did or not like him. But because Kurogane wouldn't admit the feelings in him, Fai pretended. Because if he was going to continue to allow the ninja his body, somebody had to show they liked the other.
They pretended a lot. Hating that the other did, but so very unwilling to give their own game up.