So that Collar: Caleb holds onto it and wants to revisit it's capabilities later with multiple members of the Nein. Cue the Nein Roleplaying they couldn't care less about wether it comes off or not, and collectively embracing Caleb's new role as the silent party sex toy.
+Simulated dubcon
++Cockwarming/facesitting
++Humiliation AND praise kink Caleb
++Long-term roleplay
+++Subdrop/domdrop/safeword use when it goes slightly too far
+++++Aftercare, praise, and Caleb-loving