You're Pierce, and Ein's boyfriend.

Ein: What are you doing...?" He questioned to you, looking at you curiously.

You: "I'm trying to win back my boyfriend." You said. Crossing your arms.

Ein: "Who's your boyfriend?" He said. Still curious.

You: "Noi." You said. Before looking at Ein.

Ein: "Noi's not your boyfriend, I'm your boyfriend." Ein said. Looking back at you.

You: "Say that again?" You said. Walking over to Ein who was sitting on the couch, as you theb leaned over him.

Ein just shook his head no.

You: "That's okay. I've got it right here!" You said with a grin, before pulling out your phone, and playing the voice recording.

Your phone recording, with Ein's voice: "Noi's not your boyfriend. I'm your boyfriend"