Kanda's eyes darkened while the grip on Mugen tightened until the knuckles turned white. "You are wrong" at least partly.
Lavi just shook his head seemingly unaffected by the thread of the sword. "Now-now, Yuu, you kn..." Kanda indulged his impulse to shut the hell up the silly rabbit by means of diving his head forward and pressing their lips together. He didn't loosen the grip on Mugen while refusing to contemplate whether his outburst was mostly to prove the idiot wrong – Like hell I can express just irritation and anger! – or from another deeper desires. Lavi's startled noise made him pull back.
They gazed at each other, one calmly, another slightly bewildered, and just then the bastard's look changed – Jr. smiled lazily and murmured "I still think you're amused". The Japanese exorcist growled "Shut up" and the next moment they were kissing.
His hand finally abandoned the sword in favor to put it on the back of the other's neck mildly running fingers through red locks while his left hand supported him leaning over Lavi, whose hands encircled him. They broke for air.
Kanda had enough presence of mind to wonder What the fuck am I doing? but then the redhead started trailing small kisses down his jaw line giving a little tentative lick under his ear, which boiled the blood of the swordsman making him gasp, and in turn lick Jr's earlobe tugging at the earring with his teeth, tasting metallic tinge. Lavi groaned not too quietly and tightened his grip bringing them even closer.
The added weight destabilized the balance and with a muffled cry they ended up sprawled on the seat of the compartment.
Kanda's heart was racing in tempo presto con fuoco while his mind was screaming him to Stop, for Heaven's and your sanity's sake, stop! However he took the site of Lavi sprawled beneath him with swollen moist lips, fiery locks slightly covering his blazing green gaze, all panting, and most importantly having the melancholic thoughtful look replaced by slightly bewildered and contempt expression.
The rest of Kanda's self-control snapped.
--TBC
Ha, I can't believe I'm writing it, but still waters run deep.