Science Bros Ask 3 by =ecokitty on deviantART. I love this just because putting a crustacean in Bruce's shorts is the first thing Tony thinks of and I can't say it's out of character. This man would be awesome and horrifying to hang out with.
Wayne / Stark - Iron Man / Batman
Steve and Bucky babies: Baby kiss by SilasSamle on DeviantArt
Funniest thing about this is that Captain America CAN actually pick up the hammer