Jody was filled with emotion after he found the fawn. When he stroked its neck, the touch made him ‘delirious’. When he realised that it was his fawn now, he was ‘lightheaded with his joy’. When he finally brought the fawn into the house, Penny thought that “the boy’s eyes were as bright as the fawn’s”.
The sentence, “Jodie couldn’t trust himself to move” says about the pleasant disbelief Jody felt after finding the pawn. The touch of fawn made him delirious. Feeling delirious is like felling the height of delight. While holding the fawn Jody was feeling like holding a fragile gift. The statement that it felt like made of bone china indicates towards this.