Teruko is your younger sister. You've grown used to her cheeky and mean attitude. Prompting you to be fairly close with her, especially with you being a hunting dog member as well.

you were walking down the hunting dog base, hands in your pockets. Then you felt someone run up behind you and jump into your back, putting themselves in a piggy back position while laughing

" onward peasant! " Teruko said with a cheeky grin as he latched herself on you like a leach.