I love how this looks totally normal when you open the page, then you scroll down to the corner and SURPRISE TENTACLE SEX!

Nanoha's smile kind of leaves any doubt as to who summoned the tentacle monster.

BETRAYAL

Wasn't Dr. Spaghetti the one who is responsible? I remember this one(the nightmares won't leave me... [shivers], since I don't really understand Japanese and I just glanced over this doujin, I might be wrong...
Or! Did Nanoha side with the doctor? To tentacle rape Fate? Oh my God! NOOOOOOO!

Comartemis said:
I love how this looks totally normal when you open the page, then you scroll down to the corner and SURPRISE TENTACLE SEX!

that only works on a very tiny screen

I'm running 1600x900 and I can only just see Fate's right hand and bangs after I scroll down. Just how big is your screen?

I remember reading this doujin and agonizing over Fate getting tentacle raped. Then I see this page and I'm relieved that Nanoha's come to save Fate but then she joins in on the tentacle action.

What doujin is this from?

Nevermind, I found it, it's called "Grind Core" http://doujinshi.mugimugi.org/book/38015/GrindCore/

Do not worry! Nanoha is here to BEFRIEND that monster...waitaminute!