Headcanon #4

Reiner is a very hairy man, but because he is blonde no one really notices the bushes on his chest, arms and legs. Bertholdt finds himself attracted to the soft and nearly transparent hair, playing with it before and after sex - the only difference being that Reiner complains less about Bertholdt’s odd fascination while he is still basking in post-orgasmic sensations, and even allows him to lay down his head on what Bertholdt calls: a fluffy reillow.

How Reiner reacts to being called fluffy, is a different story altogether.