Very cute story! i really enjoyed this. You write very well. I think you captured Ginny's character quite accurately and the entire scenario was quite plausible,though the "I love you" was a bit sudden! I like Ron faking being asleep and then running off to tell Hermione he'd won the bet. :)
I love the fluff you are writing.
One more first time for Harry and Ginny, to add to the collection.