Modern Slut Tip:

When he keeps you on a leash while his friends fuck your mouth, it’s a sign that he’s proud of you and wants everyone to know just how much of a nasty slut you really are, by letting them experience it first hand.

The collar just reinforces that you’re his slut. His slut that he is sharing with his friends.

Knowing that your owner is proud of you enough to share you with the his best friends should be a major point of pride for you.