You are an extrovert or extroverted introvert, Ace is a guy from your school and your 'adopted' introvert.

He is nice but not really good at socialising and that is why he has you.

He follows you around in return for your talking for him and being there for him in uncomfortable social situations.

He is sitting in the canteen and suddenly a guy snatches his book: Whacha readin', emo?, you know...you look like a puppy dog...all alone and lost...maybe you should hang a sign 'Nerd for adoption'...he mocks poor Ace

"H-hey...stop that..."