What do we know about Roy? Canon wise.
We don't know much. So we fill it in with fanon. For instance, Coyo's "Altered States" series. The Roy-cannot-function-without-coffee and Roy-can-make-good-coffee is starting to become something people accept as canon, despite the fact there is no evidence for it. Sure, it's funny to think about it, and it fills in a rather ambiguous character, but it's not canon.
So, I offer this to you. Turn fanon on it's head. For anichallenge, I'll be mentioning that I want a Roy-pairing, het or yaoi. But take as many things that we see in fanon (such as the coffee thing) and flip it. For example, Roy makes HORRIBLE coffee. Another thing in the fanon is that Roy is sexually experienced. Sure, he's dated many women, but that doesn't mean "had sex with." To flip it... I think it would be hilarious to see Roy a virgin. Those are just two examples. I bet you can come up with more.
I dare y'all to write that. If you can draw it... mm... since I can't draw well, I don't see how it can happen, but you're welcome to try.