"I promise you," Regulus vowed, "that there is absolutely nothing wrong. You know that I can't lie to you!" He fingered a curl and gently placed it behind her ear, his finger gently tracing her cheek as she looked up at him with worry.

"I just feel like something is wrong," Hermione mumbled, a light blush spattering her cheeks as she looked at the raw intensity of emotion in Regulus' eyes. "It's probably nothing."

"It's sweet that you worry so much, but I'd tell you if something was happening. I promise."

"Hermione- please," Regulus begged brokenly, watching as his girlfriend packed some of her things. "We can talk about this."

"Oh, like we can talk about any dramatic changes in our lives like you promised me?"

He opened his mouth to answer but nothing came out and she smiled stiffly, a defeated yet accepting look on her face. It hurt him to know that no matter how their argument turned out, she'd known that he'd have no excuse or words for him. Did she really think so little of him?

"That's what I thought."

"I did it to protect you!" he blurted and watched as her back stiffened at his exclamation. "Everything I've ever done has been for you."

"I'm sorry Regulus, I just don't understand how becoming a Death Eater could be for my protection."

"I don't like lying to her," Regulus confessed to Severus. "Every single thing I do or say is something that I have to second guess just in case I'm slipping up."

"Maybe you should tell her," Severus drawled disinterested.

"Tell her?" he questioned in disbelief. "You want me to tell my muggleborn girlfriend that I've joined a terrorist group that are hell-bent on killing her and her parents?"

"Maybe include the true reason you joined."

"It doesn't matter how I tell her. She'll still hate me."

"She'll definitely hate you if she finds out before you tell her."

"Please, please, please don't go!" Regulus cried, grabbing her hand to stop her. He didn't care how desperate he looked or sounded. "I can explain!"

"Explain? Severus confessed to me in the Order one night, when we were both drunk, about how he joined. Did you know that he had to torture and murder a muggle couple. What did you have to do, Regulus?" she hissed.

His face paled and she shifted her hand out of his grip, uncomfortable with being close to someone who had clearly committed horrendous crimes.

"That's what I thought." He was silent as he watched her pack the last few essentials into her bag and he followed her as she headed towards the floo to go to wherever she was going to stay. "We'll talk about getting the rest of my things some other time."

"I joined the Death Eaters so that I could join the Order!" Regulus shouted, closing his eyes on a sigh. "It was the only thing I could think of doing to appease everyone."

"Excuse me?"

"I'm a member of the Order, a spy, like Severus. We joined the Death Eaters together and joined the Order together too but when we joined, we knew that there was a rat in the group so one of us became a known spy whilst one of us worked in the shadows." Hermione was silent and Regulus kept on talking, an action so out of character for him that it showed his desperation for her not to leave. "I just wanted to help you, even if I couldn't be there with you and I wanted you to live with no worries for money so I did what Mother told me to do so that I didn't have to lose my inheritance. For you."

"For me?"

"Everything I do, is for you," he repeated.

Flying Assignment: Write about someone in the relationship telling quite a bad lie. It has to be a lie that could potentially end the relationship. (I do believe that hiding the fact you've joined a terrorist group is potentially relationship ending)

Additional prompt: a major argument