"Y/N, why did you never tell me your last name?" Sherlock questioned, sitting down in his chair, his robe falling off the sides.

You were cooking in the kitchen at Sherlock's flat for him, he really only eats things you make.

"I don't know. I guess a just like being mysterious." You say smirking. He briefly laughs. "Gives you a constant case."

Sherlock was working on another Jim Moriarty case. Everyone thought your brother was dead, but he wasn't. He's been playing games with Sherlock's every sense. You would be sad or even angry if Sherlock found out you were Jim's sister.

"Honestly, what is it? Have I met any of your family and you just not telling me?" Sherlock continued questioning, sitting up to look at you.

Shoot. You thought. He's starting to suspect things.

"You've met one of my siblings, but I'm not telling you who!" You said getting angry.

"Fine," Sherlock said, looking regretful that he upset you.

You set the food off the stove and walked over to him. He was tapping his fingers together in front of his face. Thinking in his chair. You say in John's chair across from him. You take one of his hands and hold it.

"The truth is, Sherlock, I'm afraid you'll be mad if I tell you who my brother is." You say. Your voice cracking at points.

"It's alright you can tell me. I won't get mad I swear. " Sherlock said comforting.

"My brother is...is Jim Moriarty." You say. You burst into tears.

Sherlock looked shocked, amazed even. He let go of your hand and say back to think. You put your head into your hands and kept crying. Suddenly you felt someone pick you up. Sherlock.

He carried you to John's old room ad set you on the bed. He kissed your cheek and said "I don't care if Jim Moriarty is your brother. Your not like him. Y/N you are lovely and I love you."

You nodded and mumbled 'I Love you too Sherlock.' He got up and brought you a plate of what you were cooking. He set it down in the bed and went to get himself a plate. You both ate in silence.

Over the next few days, you two acted like nothing happened. Like he never knew. All you knew, is that you loved each other.

~~~~~~~~
Sorry for it being short! That's just kinda more my style of writing, short and sweet.