the boy and girl in this oneshot are friends
the girl is not really that girly and (obviously) loves the guy
but the guy gets a girlfriend and girl pretends to be happy for him.
Then the girlfirend of the guy asks the girl to help her bake a cake for valentine's day for the guy.
Girl can't say no and helps her...etc.
In the end girl bakes friendship chocolate for every friend...
don't remember what happens then..just that the girl and the boy get together in the end (obviously).

I think it's the last story of Jun'ai Junkies ..

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Yeah it is it.
Thaaanx,
I was going insane wanting to read it again. ^^