Eiro continued trying to improve upon his aura while Armodeus fiddled around with his tail. He was placing some metal plates onto Eiro's stinger and trying to come up with new ideas or putting everything he already made together.
It felt rather uncomfortable, considering that the Demon's tail was somewhat sensitive. It's why he didn't use it for combat all that often, except if he knew that he could safely sting his enemies. The most sensitive part of Eiro's tail was the sharp stinger. It felt like having someone press their finger into his eye and rubbing around in there as Armodeus as the elder Dwarf attached the special poison-metal tip to improve upon the Demon's poisonous sting.
It just felt uncomfortable, even if he himself touched his stinger, so having someone else do it felt even worse. It gave Eiro goosebumps, something that he didn't get for quite a while.