Geis

 Geis  [-1] An Oath given is an Oath kept: Instead of taking a mild consequence in social combat, you may take an aspect, representing an oath sworn to that person instead. You may never have more than one of these aspects at any given time, so you would have to fulfil your oath before making a new one. The aspect is permanent, until you have fulfilled your oath or reconciled in another way. I'll take your word for it: If an opponent is taken out in social conflict from your attack, you can place an aspect on him that represents an oath given to you. You may invoke it to enforce that oath or make the target reconcile in some other way. You may never have more than one person bound to you like that.