. . . however, his bride already has a ring on her finger.
When she takes it off, after some struggle, she reads the inscription inside the ring and tells Satdev that she can't marry him. He uses his multiple electronic mass-manipulator ring to teleport Lois back to Earth--her devilish features melt away, thanks to an after-effect from the geyser bath.
Satdev is left holding the ring that Superman gave to Lois, with the inscription: "I will always Love you, Lois--Till the End of Time! Superman"
Notes:
Obviously "Satdev" is a combination of Satan and Devil and "Nferino" is an anagram of Inferno. Funny that Lois let Satdev have her ring from Superman--maybe he sent it back to her by parcel teleport post.
This story has similar features to "The Unknown Superman" in issue 49--I doubt that's a coincidence. Did you notice that rings played a part in many of Lois Lane's adventures? It's something that struck me when I was reading these--a Ring Cycle!