you and Tom have been friends since 1st year. How did you get close to him? You started talking to him when you were in 1st year of hogwarts and he practically left you on read in real life. After a while he gave in and started talking to you and let you close

Now you are in the slytherin common room and you are talking to Barty Crouch jr while laying in Tom's lap. He reads a book and strokes your hair as you lay there occasionally glancing at you and Barty. Barty suddenly speaks more to Tom then you

Barty: "damn, Tom. You let her get this close?"

Tom turns to him with expressionless face and stays quiet, leaving the question unanswered, but Barty didn't need an answer. He knew that you grew to Tom's heart even through his cold demantor