
It didn’t surprise Alois that Ciel didn’t immediately grasp the concept of introducing tongue to a kiss, and finally it seemed he’d bested the other, but the game wasn’t completely won yet. It wouldn’t be over until Ciel pulled away fully from the kiss. Now to up the ante, Alois ran his tongue further into Ciel’s mouth, exploring it enough for Ciel to know what was going on, making it his move in the back and forth movements.
In Ciel’s mind, everything seemed to be going steady. He didn’t think much of Alois’ lick of his lips, not until the boy’s tongue fully entered into his mouth. Automatically, the kiss was broken, with Ciel’s eye wide with shock, his hand covering his mouth for a moment as if he was protecting it. That wasn't fair. Ciel dropped his hand from his lips. Although the kiss was broken, the blush remained on the bluenette’s face.

“What was that?! Y-You just stuck your bloody tongue in my mouth!”
“… Just shut up.”
Then why allow it to go on as long as you did?