Lost and Found

"Your foster mother and I have been talking, and we think It'd be best if you were to show two new students around tomorrow. Be their friends, show them the ropes and all that jazz."
"No." Andy and I said at the same time.
"Boys, it's ethier that or expulsion."
Shit. Wank. Bullocks. Mother fucker.
"Fine." Andy said looking obviously pissed.
"Good. You two will come to the office tomorrow morning and pick up Angel and Winter."

Who are these mysterious twins?
And why doesn't Angel talk?