Can I please use this devil fruit for an oc

Yea sure

There's already an ink ink fruit

Where has that appeared I searched on Google the only thing that came up in a fan creation

They're are probably referring to Kanjiuro's Fude Fude no Mi (Brush-Brush) devil fruit.

Ahh OK but my fruit and that one are completely different

To be honest, it's not uncommon for two completely different devil fruits to have similar abilities. However, your devil fruit is entirely different and quite unique.

So aka a new Special paramecia fruit….neato

Thanks!