
This artwork is effing amazing. I knew I was going to love it the moment I saw the first image of Kotetsu inside. Seriously, this illustrator needs to fully go pro, not just do doujinshi :) I'm also enjoying the story so far but I'm only on part two. Naughty Keith was beautiful, letting go of his all-star hero persona, heh-heh! So far, so good...definitely this will be bookmarked for rereading!

The artwork makes them look younger. And page 11...geezus, Kotetsu...WHOOT! While I'm trying to find one where he tops, I certainly don't mind him as a bottom because it's done so damn beautifully.

http://myreadingmanga.info/pink-power-tiger-bunny-dj-box-eng/
There is this one, there are more but at least this will get you started? To be honest I'm not fond of them because in most Bunny is very feminine.
There is one that I liked I have to look around but if I find it I'll send you the link.

Ah, the rare "Kotetsu x Barnaby" dj! I prefer those too, but I hate it when EITHER of them is feminized. They're both grown-ass, independent mature MEN. (Okay, the word "mature" can't always be applied to Kotetsu, but that's just him having fun).
Try this one for now: http://myreadingmanga.info/tiger-bunny-dj-atarashii-hibi_katou-setsuko/
Barnaby's still a bit feminine here, but Kotetsu also has some fleeting shy moments so it's easy to forgive.
Yes, there's better ones out there and I can't remember their titles at the moment. I keep meaning to list them (for myself), but I haven't gotten around to it yet. I look forward to seeing what tisidafly finds.
There's really good one where both the characters were nailed perfectly, albeit in a very comedic way. I won't give away who-does-what because it would spoil the fun.
Unfortunately, it's in two parts and Mangago only has the first part. So back to My Reading for this little gem: http://myreadingmanga.info/tiger-bunny-dj-usagi-tora-eng/

Found one of them:
http://myreadingmanga.info/tiger-bunny-dj-invisible-man/

This is just about the only Sousuke and Rin story on this site and yet it fell flat with little plot and raucous, sudden sex. I'm usually not too picky about my yaoi but this made me sigh and skip most of it. Sucks because slowly, this has become probably one of my favorite pairings from the show. On a better note, the artwork looks like it could seriously pass for the original artwork. High kudos in that department :)
In crow form, Midori looks like one of the Angry Birds, lol! Pull back on the screen and release him to go crashing into the fox god's shrine, XD!