Clark and Arthur double-teaming Bruce, either by DP-ing him or by spitroasting him. Or both. With Bruce getting off on how strong they are, and Clark and Arthur getting off on how much roughness Bruce can take despite 'only' being human.

Bonus if Bruce keeps goading them into being rougher and fucking him harder every time they worry that they're going too far.
Bonus bonus if they fuck him all night until Bruce literally passes out between them.