Ahegao tag y/n?

Definitely.
EDIT: Considering I keep getting drawn back to this image to stare at it braindead for tens of minutes on end, I have to wonder what's got Konata so hot. Kagami has her vibrator, but other than the bite marks and Kagami's mouth, there doesn't seem to be anything going for her. Regardless, I'm happy to stare like a zombie.

Artist title and commentary, in case it's worth it:

【開き】かがみびらき・another【直り】
Kagami
「最初に言っておく！私は（吹っ切れたら）かーなーり強い!!」
Konata
「ちょ、かがみ、そこは『かーがーみ強い!!』とか言う遊び心をですネ、って、アッーー!!」
――――――――――――――――
追い詰められた兎は狐よりも凶暴だ！

The title is another reference to Kagamibiraki (and the artist's previous picture in post #830398).

【Splitting】 Kagami Splitting・another【Corrected】
Kagami:
"I'm telling you now! I (if I ever get out of this) am strong as a tsunami!"
Konata:
"Hey, Kagami, that would have been a great place to say something like 'Strong as a Kagami!' righ- eh? Ahhh!!"
――――――――――――――――
A cornered rabbit is more ferocious than a fox!

The original 'Strong as a Kagami' pun is that Kagami says kanari tsuyoi which means "pretty strong" and Konata changes it to Kagami tsuyoi which would be "Kagami strong."