Challenge of the day: Pet names

Error's POV (Flashback!):

Killer and I just started dating. We were sitting on what is now our room. I was trying to think of a pet name for him.

"Whatcha thinking about?" Killer asked, kissing my head.

"I'm trying to think of a pet name for you," I replied, looking at him. I chuckled at his blushing face.

"P-pet name...?" Killer stuttered. I giggle and nodded.

"Hm... How about Kills?" I chirped. He chuckled and kissed my forhead.

"I love it Ruru~!" He responded. I laughed and kissed him.