Identity test: failed
commence biting

Ah the clears things up. I thought it had to do with the new relationship these two have.

Can someone translate this as well? I wanna know just what Aya was saying to momiji...

I'd hate to see what she'd to Hatate then.

Double Spoiler kicked in. Poor Aya...

Well in double spoiler Hatate comments about Momiji are about a diferent relationship between Aya and Momiji than the one we thought, it seems they don't get along too well, maybe that's why now that Aya has pointy ears Momiji dislike her following the double spoiler plot.

Also since Double Spoiler:
Dog Sign 「Rabies Bite」