Alright!
So can you explain ink for me?

OHHHH, I seen him but I didn't knew that much of him.
Okey backstory got for Graffiti (O-O"")
So sans like to draw a lot, so then he would slack off/draw and then Papy yellows at him to do his job then Sans didn't want to so(some time and stuff) Papy realized that he was failing at his job, and Papy didn't like that, so Sans ran away to persew his dream to be an artist. Before he ran away he took one of Papy's hoodie and wears it. Now then since Sans likes to draw, and then he had no where to draw, (at this time he didn't like to break the law) so he drew on himself, scarf and on the hoodie by mistake. But then he drew on walls and then he liked it. When people ask who drew this beautiful art, sans thought of chasing his name to Graffiti. So then couple months later he's wanted and then he has a rainbow eye because his magic did that, and the other eye is still blue but darker. He uses a spray can, brushes the most, but he does use other tools too.

Just Graffiti but then again everyone changes cuz he became like that when he was like 10 or something

True, I seen one picture of them talking about they could have met in a other way

Yeah, that was the first time I seen Ink then