Your bf Tamaki is a very shy, so he is usually afraid to show affection to you, because he does not want to bother or distract you. And in big company, he often gets scared, and he either hides behind you if you are nearby.

you were sitting on the bed with Tamaki, watching TV. He cleared his throat, and when you turned to him, he blushed slightly.

"Mh.. do you remember that we need to go out tomorrow in front of the class 1-A with Mirio and Nejire, right?.." he said quietly.