I don't know where you can read Corpse online, but I imported it from Japan at my own expense. It was fairly expensive to do so, especially since I paid for quick shipping and other fees...
But it was more than worth it! All the AyaTei gorgeousness! asdfjkl;
Anyway, I got lucky, as I hear it's almost sold out in Japan, so the ones that are left cost even more to import than I paid.
But again, it was WORTH IT! Totally worth the cost! Such lovely art... such a smexy couple... such a sexy doujinshi... *drools*
Sorry, but I have to stop here. Talking about it here makes me realize how lonely my Corpse doujinshi must be. If you'll excuse me, I'd like to go... give it some company, if you know what I'm saying.