Figured I'd add instead of edit, so that the topic gets bumped.
Here are links to the stories I posted above:http://www.eroticgayhypnosis.com/ncmc/html/ncmc.htmlhttp://www.mcstories.com/Tags/mm.htmlhttp://www.musclegrowth.org
Here's another good repository of stories (muscle growth themed, but not always):http://omelissokomos.blogspot.com/http://storiesonline.net/home.php
has a selection of gay stories.
If you're into choose your own adventure type stuff, there is a fairly large number of gay chapters at:http://www.cyoc.net/index.php
. Check out the index pages on the navigation bar on the left for the root of the stories, or go to the update page.
If you're into choose your own adventure stuff, and super heroes, there's also:http://www.superstories.net
. It's gay and straight, and mostly mixed in. But if you're into erotic stories, there's some ok stuff there.
Along the same lines, there's also the transgender oriented site:http://www.sapphireplace.com/cgi-bin/fbindex.pl
www.mcstories.com also has a list of links to other sites. http://www.mcstories.com/Links.html
That might be useful.
mcstories is actually hosted by asstr.org, and there's a whole library of erotic stories there, although I've never found a good way to navigate it, so don't really know what's on it.
There's also the Literotica site: http://www.literotica.com/stories/stories_by_category.php?category=6&page=35
And for the URL challenged above me www.motnes.com