Premature ejaculation or impotent fics?

[5up3rn47ur4l.livejournal.com]

I was wondering do you know any B/J fics about premature ejaculation or impotent? I don't really what tags I should be looking for but I've checked a few and came up with nothing. I'm pretty sure there aren't any but guessed I'd ask. Thanks :)

Edit: Couldn't find any but got a link for a cancer fic which is worth checking out :) Link in the comments!