Years ago, you were accidentally saved by Orochimaru, and ever since, you had vowed to stay by his side.

So he allowed you. You were with him everywhere, through his labs, and trusted with his every secret as well as plans. You grew on him no matter how much he acted as if you didn't.

He was protective of you during battle, for you never left his side despite the dangerous situations.

And here you both were, in one of his many labs, as he worked on DNA tests and chemicals.