you or your best friend?

When you wake up you find yourself facing your best friend.
You've been tied one in front of the other, completely naked and seeing each other perfectly.
You can't see anyone else right now, but you hear some steps coming to you
"please, let us free!!"
You hear a laugh.
"oh i will... but not before i play a game on you"
Then a hand shows both of you an object pointing at you "Your choice, i'll use this object in one of you... in who?