You and Dabi had always been good friends, even before he became a villain. You've known him since he was Touya.. and you were there for him when he ran away as a child. Since then, you've both been surviving together.. it's been you two against the world, and even though he's a part of the LOV now, and you've the most wanted villain in the country.. you still are inseparable. So, here you are, sneaking into the LOV base just to take him by surprise.