Life is Short, Fall in Love

That's a nice title. The Tsundere and Vanilla tags go so well together, and with a title like that, really raises your expectations...And then delivers! Loving the great artwork too.
Hmm...Usually when a Hentai Protagonist catches a girl masturbating to a desk in class, it'd be his desk, but uh...I guess not.
Also, "Why is doing it with Sensei so much fun"? That, my friend, is the first sign of love, I would say. The first sign of some sweet Vanilla loving to be had. It was so adorable though when she confessed to herself that she had already long forgotten about Tojo because she fell in love with Sensei. Just...so cute.
I wasn't entirely sure what to make of that ending since the last panel confused me a little, so I went and confirmed what it said in the original raws. I think I would have translated her first line in the last panel as "Looks like I'm the kind of girl that fully devotes herself to the one she truly loves!", which was apparently an explanation about her making a bento for someone else. followed by "see you later." with a FULL STOP, since she was saying goodbye to Tojo before running off to meet her beloved Sensei.
Making it an ellipses (...) instead might cause...unnecessary misunderstandings, as if she suddenly decided to leave her beloved Sensei for the other guy, Tojo. But then again, I'm sure this artist wouldn't want to ruin a perfectly lovely sweet Vanilla release like that!

Yeah! Suck it Tojo!!!

This is one I can keep coming back to. A favourite among favourites :)

Ah, she's adorable. ^_^

And falling so completely for Sensei, she won't even care anymore when her original target shows interest in her later.

tender. that had the right feels...

Bar the last panel being a tad confusing, this was nicely done.

The title, the tags. Be still my heart.

That last panel's speech bubbles make it seem like she's dumping the teacher to go be with Tojo.

Kogals need love too. Vanilla for kogals!

The eternal struggle of a tsundere to finally become honest about her feelings ... and that's probably just how we like 'em.

Please, this needs a sequel. It was too cute!

A nice title, I hope the story holds up to it!
Spoiler alert: it does!