Thank you for the picture.
This looks more like the result of some dominance ear grooming crossing the line into ear nibbling. it will hopefully settle down once the hierarchy is firmly settled and the group fully established. At the moment, your companion is likely still feeling insecure and a bit stressed.
Ear licking, gentle nibbling (this has gone just a tad further) is the mildest form of dominance and translates roughly as 'I want you to be a member of the group I am leading'.
How large is your cage and how long have you had your boys?
A Comprehensive Guide to Guinea Pig Boars
Bonding and Interaction: Illustrated social behaviours and bonding dynamics