All of You
A tiny part of your programming you can truly call your own. A small part is made up of bits of everyone else that they unthinkingly imprinted into you: Roll's kindness and Blues' determination, right down to Glyde's good manners, and the rest of you is made up of two words repeated over and over again.
Here is your mantra, your purpose for living, the incantation to the greatest spell.
Yuuichiro had to be sure that you would protect his only son after all, so he built you a cage out of those two words. These sharp lines are your bars, here are the soft curves of your chains and this single circle is the band that you are held within.
You say that you are not imprisoned. That you have put your foot down with Netto many times (especially on the subject of education) and that the choice to stay by Netto's side was purely your own because Netto is a great person and it's pretty impossible not to end up liking him.
How lucky for you that Netto Hikari is such pure hero material that you will never have to consider who would come out on top in a battle between your morals or loyalty to Netto, to consider if it would be truly possible for you to turn your back, walk away and keep going without glancing over your shoulder.
You will never be free of Netto, whether it is the person himself or memories of him or his name repeating itself over and over again within you, but perhaps you are happy that way.
A tiny bit of you, some of them and the rest is him.