Zinged by the Master!
Well, fangirls, I've translated the panel following Shinobu's "Suki da ze, Mitsuru."

I now have no doubt in my mind that Shinobu is indeed saying "I love you, Mitsuru."

But! Before you rejoice, listen to what Mitsuru says in reply.
I love you, Mitsuru.
Aw, you don't mean it!
Mitsuru: C- cold -

Shinobu: That was fast.

Shinobu: Didn't you have some business next door?

Mitsuru: Huh? Yeah.

Mitsuru: It's fine now.

Shinobu: Hmmm.
Mitsuru: How long are you gonna laugh?!

Kleenex Box FX: Bakon (Bonk!)

Shinobu: Oof.
Shinobu: I love you, Mitsuru.
Mitsuru: You're only saying lines like that to stir
up the readers' hopeful expectations in vain, so
cut it out!

Shinobu: Right. ^ ^
D'oh! We've been had! >_<
(Still, you have to admit, it *is* pretty funny.)
Biii da!