"Bad Wolf? As a Bad Wolf virus?" – asked River with surprise

"Bad Wolf virus? What's that?" – asked Rose

"It's a virus that destroyed every file on you, Rose, in every database in the Universe" – answered River – "I tried to find information on you, when I first heard your name but I found none."

"Ha, interesting. So, Bad Wolf protects you wherever you are. Good." – said the Doctor in wonder.

"What is the Bad Wolf?" – asked River again.

"It's hard to explain and better not" – said the Doctor in a hurry – "Think of it as Rose's personal guardian angel. We don't have time for this. We need to send you home while it's still possible."

He grabbed Rose's hand and run into the console room River followed them quickly.

"Now, River. The TARDIS and I know what to do, we'll go to the exactly same planet at exactly same time as it was in your Universe, basically we have to repeat what happened to you, until the crack is open as soon as you'll leave, I'll close it."

"So I have to jump in the Volcano and press the yellow button?"- asked River

"What? Doctor, no!" – Rose practically yelled

"There is no other way, the wave and the power of the hopper has to combine so River could be pulled off to her home universe otherwise she will trapped here forever and everything will be destroyed" – he looked at River – "It's our only chance, for all of us and the Universe. Too many tings depends on you, Professor Song."

River knew he was right, to tell the truth she suspected it from the beginning and she was sure the Doctor knew that too.

"I'll do it, I need to come back. After all, I still have two dates with my Doctor"- she winked at Rose

"But what if something happens to you?" – Rose asked frightened

"What a life we all would have without a risk? Besides, someone has to deliver your letter to our Doctor."

Rose took it from her pocket and handed to River and after a moment pulled her into a hug. River was stunned first, but then returned the hug.

"Thanks for taking care of him. Take my advice someday, ask him" – said Rose.

"I will. Someday. Good-bye, Rose."

"I'll give you two some privacy."- said Rose and left the room.

"So this is goodbye, Doctor" – said River bravely

"I suppose it is. You'll need to destroy the hopper when you are home" – he looked at the letter in River's hands – "Drop it, River. Don't give him letter from Rose, he doesn't deserve it."

"That's for us to decide. I'll make sure he'll get it only when I am gone. I can be selfish sometimes too you know, I don't want to discuss with him this adventure. I saw everything I need to know."

"We don't deserve you. I am sorry for everything I'll ever do." – the Doctor said sincerely

"Apology accepted." – she said with a smile – "Don't be moody, Doctor. You've got a great life here and I need to return to mine." – with that she laughed and left the TARDIS. In a minute the Doctor and Rose heard a huge explosion in the volcano, they checked everything out but saw no signs of River. Well, at least this plan worked out well.

They were floating in the vortex, the TARDIS was just somewhere in space. Rose informed Jackie and Pete that everything was fine, that River was send home. After that they hurried up to their bedroom, they made love that day for hours, not wanting to let go, saying things they already vowed hundreds of times, they wanted to be sure that everything is fine, that they still got each other that nothing can tear them apart. Rose was lying on the Doctor's chest and asked suddenly:

"So how much of my conversation with River have you heard?"

"Most of it…Well, all of it. I knew you'll talk and I wanted to know as much as possible"

"Eavesdropping is a bad habit, you know."

"Yeah, but you wouldn't want to share that with me and I didn't want to put you into uncomfortable position."

"Yeah, right. Doctor, I know you. Just admit that you were just curious about your possible future." – smiled Rose

"OK, maybe a bit, but it doesn't change anything. I needed to understand, now I do, sort of. But it doesn't matter really." – he looked into Rose's eyes – "I don't care about him, or what life he'll lead. I care about us. I am glad that you could pass the message so you'd be able to make peace with your choice."

"I might still have dreams, you know. I love you, Doctor. But I care for him too. Not as much as I care for you now, but I do. He is still a beloved memory and he always will be. After all" – she smile – "You are the same man."

"I know. And I don't mind as long as you are with me." – he swallowed - "Rose, I need to ask you something. If someday. In the future, I mean. He will find his way here and will ask to travel with him, will you go?" – Rose's mouth fell open – "Please answer me as it is, I wanna know. I'll understand, I promise."

"Are you nuts?" – asked Rose

"What?"- she punched him on the arm – "What did you do that for?!"

"What did I just say to you? He is a beloved memory. Yes, I'll always love him in some way and I'll always be worried about him, but I LOVE YOU, this you, our life here and I wouldn't change it for the world even if all of your other incarnations came here and asked me to come with them! So stop being stupid."

The Doctor said nothing, he was just grinning like the idiot he was and snogged his beloved wife.

Epilogue

Everyone's gone. Amy and Rory…It's been 5 years since I saw you my dear Amy, I hope that Rory makes you happy. I know you said that you'll love me always, but you wouldn't have if you knew that three days ago I send your daughter to her death. My personal psychopath, now she is gone too. I cared deeply for her, even though I never loved her like… It doesn't matter now anyway, they are both gone.

The Doctor was wondering across the halls of his TARDIS, he lived on the cloud now, he doesn't want to save the Universe anymore, it took everything from him. He just wanted to live out his days and die at peace. The TARDIS led him to the library with his favorite pool. He didn't know why she brought him here but he obeyed his old girl. On his beloved chair he saw an envelope. That was weird, he was sure that he didn't leave anything here. He took it and his hands started to tremble. On the white paper there was only one word : Doctor. Written by the hand he'll never forget. He opened it with the speed of the light, he knew that it was impossible, but:

"Hello, my dear Doctor.

I don't know whether you'll get this letter or not, but I decided to write it to you anyway, just in case. I believe now you wondering how the hell did it happen? I'll tell what I know, the thing is that 3 days ago something big happened and by accident River Song appeared in our Universe. I know you said that's impossible, but you made many wrong assumptions, didn't you? Anyway I think that this is my best chance to say a proper good-bye to you, this time forever. I know I promised to stay with you for as long as I can, but the Universe had other ideas. I write this to you because I know you, I know that you questioned yourself whether or not it was the right choice on the Bad Wolf Bay and I'll tell you, yes. It was, by many reasons, most of which you know better than I am.

I want you to know, that we are very happy, just as you hoped we would be, mum, dad and Tony are happy too and we expect another member of the family, oh God, I hope the mortal you will be happy to hear that he'll be a father soon. I just think that you should know that we live a full life and it's all thanks to your great sacrifice, I can understand that now.

I'm hoping that one day you'll be able to look back at our time together and remember only the happy moments, that concerns Martha, Jack and Donna as well, and all other companions to come. I hope you'll find your happiness with River and peace for your soul. Forgive me for being selfish but I hope that there will be a tiny place in your hearts for me, because there is always be one for you in mine.

Good-bye, Doctor. Don't ever give up, I know that best days for you are still to come.

Love, Rose."