Fifty years into the future (around 2023), during the war with the Sentinels

He looked at Charles as Logan volunteered to go back to the past to attempt to change their bleak future.

"You'll need me as well." He started to say to Logan, who was taken aback.

"What?"

"And not just me, but Charles' sister, Charissa too…. After Mystique left Charles she came with me and I set her on a dangerous path, a darker path. Charissa also joined us subsequently. It's going to take the three of us, Charles, Charissa and I, side by side at a time when we couldn't be further apart. Charissa has always been close to Mystique so she may be able to persuade her and stop the assassination. In addition, and you must promise me not to tell our younger selves about this additional purpose, Charissa will be able to stop my younger self from being too stubborn and headstrong in your mission. She's always had a way in reining me back."

Logan raised his eyebrows and looked at Charles then who only nodded in agreement.

"Great. So where do I find you and Charissa? What the hell happened to her anyway? I've only seen her in photographs in the Professor's room."

"Well, it's complicated. Charissa was captured by Trask in 1963 and experimented on for more than a decade. She survived the experiments because she has rapid healing abilities like you as well. All her memories, which included the use of her telekinesis powers, were wiped out by Trask. After Mystique kills Trask, she is also taken to the same labs where Charissa had been held captive and both of them eventually escape. Charles manages to heal her mind, but Charissa couldn't handle the stress and depression which returned with her memories, and so, she runs away again. I tried to help her as best as possible, but fail. Charles and I do not know where she is now. We never manage to find her again. As for myself, I was in a glass and concrete prison under the Pentagon in 1973. If I wasn't incarcerated, I would have rescued Charissa myself."

Logan suddenly looked interested in what he was saying and asked again, not caring if it sounded straightforward, "Was she like your girlfriend or something?"

He refused to show Logan his true feelings towards her, and only replied with a straight face, "I cared for her back then. Now that you know about this, you can use this to your advantage when you meet my younger self." He hated it that he was also starting to use her as leverage against himself, but unfortunately, it would be necessary if they wished to change their future.

He needed to help her in whatever way he could, and he knew his younger self well. If he was freed by Charles and Logan from his glass-cell, he would want to rescue Charissa immediately as well, and wouldn't listen to a word about anything else if he knew that she remained in the labs for another day.

Logan didn't have to know why she chose to run away again, and Charles had been discrete about telling anyone else about his sister and her personal problems. If anyone else knew, it would be Hank, but Hank was long gone, killed brutally in their fight against the Sentinels.

He wondered if the Sentinels had gotten her as well, and if they did, he only hoped for her sake that her death was swift.

He remembered the vacant look in her eyes when he finally saw her again, when she was recovering at the mansion after Mystique and she escaped from the labs. The empty calm blue in her eyes had reminded him of a lake he had seen in Austria. He nearly broke down in front of all of them, but thankfully managed to compose himself. Only Charles could sense his pain and had tactfully refrained from commenting. He visited her nearly every day while she was undergoing therapy with Charles.

At first, she would smile warmly whenever she saw him. But as her memories returned, she acted colder and colder towards him.

"Why do you come here every day?"

"I want to see you recover."

"I will never recover fully. It's not just my mind that's broken." She said bitterly. "Please just leave me alone. Go away Erik. It hurts to remember you."

"I made a promise to you once, to never let you be alone."

"I won't hold it against you for breaking that promise. I am happier without you. What's your purpose in being nice to me now anyway? You want me to go back to you, and then suffer and run away again because of your war? I feel very tortured every bloody day. It kills me inside to share the same thoughts as you now. I hate the people who did this to me and I hate it that I'd lost more than ten years of my life trapped in a shell of a body and mind. But at the same time, I do not wish to turn into you. I want to hate you for sharing your vision with me, and for being right about humanity. Unfortunately I am unable to feel that way."

He didn't know what to say to her then, and took some time to reply, "I'm sorry about everything, and for not being able to protect you. Please let me make it up to you now. Do you also remember what happened to our baby?"

"The baby is dead. Please stop asking me about this. Just go. You don't need to do anything else for me." She replied flatly and emotionlessly, and looked away from him.

He left but returned the next day and she still refused to speak with him. He felt hurt by her actions and she behaved the same way for a whole week, until one day, he received news from Charles that she had left in the middle of the night. She had learnt how to reinstate the mind shields in her head and so Charles could not locate her even with the aid of Cerebro.

He also tried searching for her, but never succeeded and so only set out to do what he thought was the best for her and in such circumstances, to achieve his goal of establishing mutant supremacy in the world.

Thinking back about that moment in time never failed to upset him, even though it all happened a long time ago.

He looked back at Logan again, who was lying on a slab and Kitty had just finished explaining to Logan what would happen in the time travelling process.

He couldn't help but question Charles, "Do you really think this will work?"

Charles replied confidently, "I have faith in him."

"It's not him that I'm worried about, it's us. We were young. We didn't know any better."

"We will now. And there's Charissa as well. She will be able to assist Logan."

"Will she trust us without her memories?"

"She will trust me at the very least. And she would understand why the future has to be changed. In that light, she would be able to stop you as well from making impulsive and dangerous decisions."

He nodded in agreement, and thought again about how much he missed her all these years, as he watched Logan scream before entering into a state of unconsciousness.