So, last night I decided to see if anyone had put an XCOM/Nanoha story up on ff.n. I mean, if I can come up with an interesting-ish idea, surely there's at least 5-10 idiots that slapped something onto ff.n out there, right? Nope. There's XCOM/Sailor Moon, XCOM/Invader Zim, and even XCOM/Minecraft for fucks sakes, but no XCOM/Nanoha. Looked in XCOM/ME and found this.
Psi Effect
A fun-loving asari mercenary finds herself a little in over her head when she ends up abducted by terrifying aliens from beyond the galactic frontier. These asari-like creatures call themselves 'humans.' They seem to be secretly nosing about on the borders of known space, acting through proxies, conducting covert operations, and they've got a deal for an enterprising asari...
Crossover - X-Com & Mass Effect - Rated: T - English - Humor/Sci-Fi - Chapters: 11 - Words: 105,131 - Reviews: 263 - Favs: 882 - Follows: 1,098 - Updated: Nov 22 - Published: Jul 20 - U. Wrex, Daro'Xen, Shepard (F), Shepard (M)
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Also, if you missed it, A Demon Among Devils is up to chp17. And the ending of 17. Hee.