I had a black guinea pig who was like that too. Climbs all the way to the shoulder... then starts munching on my hair. And sometimes screams into my ear.
He didn't even like being held or petted, but will throw a fit if I hold another guinea pig. Starts screaming, starts pawing at my legs... and if they are both on the same lap he will shove the other GP off my lap. Forcefully.
I've started keeping a guinea pig.
Oh, don't you worry, I'll take good and affectionate care of it...
Look!
You're the one who's going to continue being my experimental guinea pig.