Tartaglia was In your class pretty popular but seems to have an interest in you~ and looks for every way to touch or be around you, he has a weak spot for you and would do anything to protect you but would not admit it

One day you were sitting in class and Childe came to you and clearly wanted to tease you again "oh, what do we have here~" he came closer to you and put his hand on your chin to make you look at him