pink hair literally do not care
Sorry but I'll never be over this. I have varying shades of blond hair - sometimes more dark blond (my natural) and sometimes more bleached - but always willing and able to receive some pink pigment. [Note if your hair is darker this isn't as 1-step; you'd have to lighten for the temporary pigment to show].
Anyway, once you've got a surface for color .... natural or otherwise ... it could not be simpler than slathering on Go Deep Overtone Pastel Pink Weekly Treatment. It combines extra concentrated color with a rich deep conditioner to get unique, vibrant color and soft tresses.
I freaking love it and wish I could use it all over but I'm not really in that vibe of my life now ... so please let me live through you, while I consign --