Haha, that is so cute.

Oyashiro-sama is STALKING!

Turn around and it's death by moe.

He probably thinks he can't control himself of what he might do if he turns around. At best he thinks he'd humiliate himself.

This seems to be a referance to everyone saying they can hear Oyashiro-sama following them...
*peta, peta*

Aye. Oyashiro-sama's power is known to drive people to insanity. Refer to post #85395.

Incidentally, there was a tag for Shiki Tohno's infamous line?

Moe Pwnage incoming!

That's pretty much Keiichi's reaction to everything in the first place.