I really enjoyed this. It's very sweet, but I don't find it too sentimental or the ending too abrupt. I really enjoyed the way that Wakka showed his affections as a young person by behaving badly. That strikes me as something he would do.
I love how he feels betrayed by the way Chappu and Lulu form a connection and I like the way he characts Lulu's changes of mood so closely.
I enjoyed reading this.