Tamaki was very shy with you, despite being your boyfriend. Even with a simple kiss, he would have to take a seat and cool down because of his embarrassment. Hence why, when you sat on his lap while was writing, he almost fainted. He let out a loud yelp and went bright red in the face, his entire body beginning to tremble as he just stared up at you in shock. He managed to gain enough strength to squeak out:

"U-Um... b-bunny... w-what... a-are... y-you doing?"

Tamaki stammered out, looking up at you shyly.