In my universe, Sonic 06 happened and was then split off as implied in the games. Only Silver fully remembers the events, and spends his days jumping between timelines to prevent any other bad future from happening.
Blaze from crisis city sacrificed herself to defeat Iblis and was reborn as princess of the Sol Dimension in Sonicās time. [full post here]
The story goes on like this:
Blazeās father, the king of the Sol Empire, is old in years already, so Blaze took over some of the royal duties at a younger age and often appears as her peopleās ruler even as a teen. One time, when her kingdom is in danger, she lands in another dimension, which feels strangely familiar. There she first meets Cream, and eventually Sonic, who she first sees as an enemy, but at the end becomes an ally, a friend even.
When Silver meets Blaze again in the present through their shared friends, he immediately recognizes her, she doesnāt recognize him though. He is ecstatic to see her again, but is disappointed she forgot him and everything they had been through together. He knows he has to hold back to not confuse her. Blaze, though, is very confused, because Silver treats her like an old friend, and he does seem so strangely familiar, even so they are from so vastly different points in time and space. She canāt explain it.
They quickly become friends again; they just are an unmatchable team. Sometimes, Silver drops hidden references to their old life, just to see her reaction. Even so she doesnāt remember him or their life together, Silver really enjoys spending time with her again, and often suggests activities they had talked about doing all this time ago in the future, things they would have done if Iblis hadnāt destroyed their world.
Eventually, Blaze does get her memories back, through an incident with the Chaos Emeralds. Though it throws her for a loop, it puts a lot of loose pieces finally together that had bothered her for a while, strange dreams, unexplained feelings, her relationship to Silver. She quickly forgives him that he didnāt say anything; she understands why he couldnāt.
Once Silver decides to stay in the past for good, he starts spending a lot of his time in Blazeās world.
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Finally, when Blaze turns 18, she becomes queen in title as well, and she raises Silver to be her right-hand man. He spends even more time with her now, getting to know her world as well as his.
He loved travelling with her and being a bit more carefree, but he understands her love for her people, and he liked that she wanted to make him part of this part of her life. She knows not to overtax him with courtly duties, and to leave him freedom and space, but he quickly becomes her most trusted advisor, with his experience after having travelled so far and all the different times he had seen.
Knowing his love for plants, she lets him have his own personal corner in the royal gardens, and, after seeing what he did with it, lets him be creative with the rest of the gardens. Sometimes she joins him.
They are perfectly capable of being apart, but do spend a lot of time together, eat together and even sleep in the same bed sometimes, and the whole court just secretly calls Silver the queenās lover.
Contrary to this believe, Silver and Blaze donāt think of themselves as lovers. They havenāt even kissed, and neither of them is desperate to be in a relationship with anyone, least of all a physical one. Only later they realize they are both asexual, and, in all terms and matters, are already in a relationship with each other, just without the physical aspect. Even their friends make bets behind their backs when they will be official.
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When Blaze is 27, her advisors and minister remind her that she has a duty to her kingdom to think about marrying soon and producing an heir to the throne. They remind her of her father, who had married four women before he was finally able to have a child, her, at quite old an age, and she as a woman, doesnāt have that much time. It had almost caused two civil wars between the kindomās nobles about the question of succession, and they want to avoid a repetition of that. Blaze is frustrated about the way they talk to her, but she knows they are right. She is surrounded by people whoād like nothing more than to have her power, and she has to secure her own line to keep them from getting ideas, and to keep the kingdom stable and peaceful. But the whole ordeal makes her head ache. She tells Silver about her thoughts. Her most likely options are to either marry one of the noblemen of her kingdom which would gain her more support of the powerful families, or marry a younger prince from a neighboring country, which would get her alliances. In both cases sheās sure her new husband (and his family) would guaranty to bother her, trying to get more power through her, even so she is the rightful queen.
Silver is appalled by her clinical assessment of the situation. Neither of them has any experience with romance, but if he has learned anything about it from his friends itās that you should marry out of love, not because you have to. They discuss it, and he understands her duty to do it, but asks her to at least give herself enough time to think about it and find someone she truly loves. Blaze says sheās met most of the guys that would be suitable, and none had been to her taste exactly, but sheād do. Silver doesnāt like it. Her husband should be the person she loves most in the world, her best friend, someone she can rely on and fall back on in hard times, someone who has her back, always, as queen and as a person, especially if theyād have kids together. He just wants her to be happy.
This night, both of them have a lot to think about. Silver is confused that he dislikes the thought of Blaze marrying some noble so much. He knows some of them and theyāre not too bad. At least, he tells himself, heāll be fine with it if she finds someone that makes her happy. Blaze thinks about his earlier words. When she tries to think about a person she trusts completely and wants to keep at her side for the rest of her life, she only thinks of Silver. Then she has a realization.
A couple days later she has made a decision, and when she talks to Silver, she proposes to him with a traditional engagement necklace. Silver is flabbergasted, completely taken by surprise.
āYou said the person I marry should be my best friend; the person I love most in the world, and someone who always has my back, whether Iām acting as queen or in personal matters. Youāre this person to me. I love you, and I want to be with you for the rest of my life. Thatās what marriage is.ā
Silver is confused about what he thinks. He points out that she is supposed to find a man to make babies. Blaze asks him if that would be a problem, but she tells him sheād consider him a very suitable partner to have children with, and believes he will be a good father.
As given by tradition, Blaze gives him a little time to think about it, but in the end, he doesnāt need much time. It makes so much sense all of a sudden, his feelings and thoughts. He only wonders what her subjects will think, but Blaze doesnāt care. Most of her people have a high opinion of him anyway, and if her advisors want to force her to find a husband, they canāt argue with her choice. Silver is a noble, courageous hero who has been loyal with her kingdom for years.
They tell their friends, who are more than a bit surprised about the wedding, since they didnāt even know they were dating.
Silver is a bit uncomfortable with the whole ado around the actual ceremony, but the royal advisors insist on the traditions. He becomes Prince Consort; in Blazeās absence he can take over royal duties, and generally speak in her name.
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In short succession they have their two sons, Atlas and Ignite, and their daughter Snowwhite.
[more about the kids here, here and here]
[Blaze's and Silver's older designs]
