They met on Grindr, when Ed was twenty and Roy was thirty-four. They had both just gotten out of long-term relationships. Ed and Winry had mutually broken up, deciding that they worked better as best friends than as lovers. Roy, on the other hand, came to terms with being gay and had amicably split with his high school sweetheart, Riza Hawkeye. Neither were particularly ready to jump into yet another serious relationship.

At first they were...apprehensive about one another. Roy seemed to Edward to be an arrogant know-it-all who liked to rely on his good-looks (though Ed grudgingly admitted that he was relatively handsome). Roy thought Ed was an insufferable brat who blatantly lied about his age on his profile (he had put 5'4" on his profile, but it was abundantly obvious he was 4'9" maximum, and only when he wore platform shoes).

When they met offline at a Starbucks, things didn't go much better. They bickered like an old married couple over the smallest of things. A fight nearly broke out when Roy made an offhand remark about Ed's height, or lack thereof. It was a wonder the two made it to bed together.

When they did, though, it was like magic. It seemed their bodies fit together perfectly and they were so in sync with one another. Roy was, for the most part, the dominant partner, to which Ed protested quite vehemently at first, but was persuaded surprisingly easily.

They found they had both enjoyed exploring their sexualities together. Roy discovered he loved Ed's hair down so he could pull it and seeing Ed in a very tiny miniskirt (with nothing underneath, of course). Ed, despite initial misgivings, really enjoyed Roy dominating him and what's more, especially relished in trying to take back the control Roy had claimed and ultimately failing.

That was how things went for a while, with them fightling like cats and dogs and only were civil to one another when they were fucking. The only time Ed called Roy by his given name was in the heat of the moment, when Edward was being pushed over the brink and came hard-otherwise, Roy was either bastard, or, if Ed was feeling particularly charitable that day, Mustang.

Roy was the more reasonable of the pair, though every once in a while, he couldn't resist making a quip referencing Ed's being short, even if it meant having to dodge the inevitable kicks and punches the younger would send his way.

Eventually, though, they did learn to find some non-sexual common ground, and that improved their relationship by leaps and bounds.

When their sexual relationship started, they had agreed on some ground rules.

Rule Number One: No kissing or holding hands. "It's too intimate," Roy explained. "You don't kiss or hold hands with your fuck buddy."

Rule Number Two: No sleeping over. This rule was only brought up after they first slept together. It was awkward waking up naked in bed together after a night of fucking. Also, Ed was a bitch to wake up.

Rule Number Three: No cuddling. 'Nuff said. They weren't a couple, they weren't going to pretend like they were just 'cos they had amazing sex.

Rule Number Four: Communicate properly. Just because they weren't romantically involved, doesn't mean either of them were allowed to shirk on talking things out like a goddamn adult. If Ed didn't like what Roy was doing sexually, he was expected to tell him. If Roy had a problem with Ed's behavior, he was to share his thoughts. This was the second most important rule, after Rule No. 6.

Rule Number Five: Yes, they fucked regularly. But as much time as they spent in bed, it was important they kept their friendship up, too.

Rule Number Six: Practice safe sex. They were by no means exclusive or monogamous, and therefore, to protect both of their healths, they were to always wear condoms and regularly get tested. It just happened to work out, though, that they didn't have any other partner besides each other, but still. Gotta keep all bases covered.