...Wut. There's a DMC-Touhou crossover fanfic!? Why isn't this in the pool already? And where do I get it!
Practically every illustration drawn by Banpai Akira under the DMC-Touhou Crossover tag is part of that fanfiction project. The thing began years ago as a series of AVG-ish videos on niconico. Try search 楽園と悪魔 on it. It's not translated, and the Nero part is somehow removed by the author due to some copyright problem, but it's funny and awesome. There's actually this part in which Suika and Dante drink all the wine from Reimu's stash which is originally prepared for sacred use. And Reimu almost beat them to death. Yes, Reimu is the overlord of Gensoukyo as always, even in front of Dante.