Congratulations! Hooray for brother-love!
My own twin boys are nearly 6 and they are best, best friends. When I was newly pregnant I thought that *surely* at least one of the babies would be a girl. We decided to find out specifically because we were afraid of the "twin boys" possibility. We were broken in slowly since one baby was shy at the first u/s and for a whole month we only knew that one of the babies was a boy. Once we found out about the other one, it took us about an hour to adjust, and then we were excited. And while I maintain that I think the easiest kind of twins to have (if there is such a thing) are boy-girl twins, in the end of course, it doesn't really make that much of a difference.
Do you have any guesses about zygosity? I think I remember the doctor saying that there was a 33% chance that mine would be monozygotic (though I was 98% certain that they would be dizygotic since I conceived them on clomid).