Sometimes Lavi would be jealous of the relationship Allen and Kanda has.
It's not that Kanda is a better seme than Tyki- because Lavi is pretty sure no one can be a better than Tyki. Be it the Noah's gentleness, mysterious aura, or handsome face, every thing about Tyki attracted the Rabbit to him. But Tyki's virtues were not all of Lavi's worries.
Because Allen is the definition of cute.
The way that white-haired boy, spoke, smiled, fought, acted- even when he eats 500lbs of food every meal, Allen would still be cute.
Lavi didn't know how he could compete to that.
He would overhear Kanda and Tyki arguing. Sometimes they would fight about the best uke. There are times when Tyki won, and there are also times when Kanda won. He didn't understand how Tyki can declare that Lavi is better than the adorable little Allen while meaning it.
'Maybe' he would think 'we should switch ukes', because Allen is undeniably cute and Tyki is undeniably perfect. But just the thought of giving up Tyki or having Kanda top him was enough to make the future bookman want to puke.
So on one faithful day Lavi gathered up his courage and finally confronted Tyki.
Allen is so cute. But I am just a dense, annoying, oblivious, successor of bookman. How can you like me? How can you choose me?
When Tyki smiled at him, Lavi remembered how lucky he was to see Tyki's beautiful smile- unlike that smirk he gives everyone else.
I have the world's most dense, annoying, oblivious, bookman by my side. Why would I want anyone else?
And with a peck on the lips, the annoying and oblivious rabbit fell in love with his too perfect boyfriend all over again.