Full Metal Rambling

This is an awesome fanart. My writer's block has intensified, but I'm enjoying a marathon of Full Metal Alchemist. I have started to ship Ed/Winry, but still don't understand Ed/Roy. I guess it's because I tend to think of fictional characters as in the ball park of the age they usually are. So I'm thinking of Ed as a teen and Roy being at least 30. Maybe I'm just not much of a shota fan...