This is after the first meeting between Jieun and Tia after the conference.
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"Did you enjoy your time here, without me?" Jieun asked
"What are you talking about?" Tia was confused but after a second she realized that Jieun had also come back in time.
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At the fountain, you guys already know what happened Tia almost fell, ruve caught her there was a scene in which he was about to confess and Jieun saw them. ( I was too lazy to write this since it's late here already, additionally I'll focus on Tia x Sein scenes)
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I don't know if you guys have read the manhwa but basically, I won't spend much time on chapters that have already been written on the original novel.
I'll do multiple time skips until I don't use the original timeline, I'll also make a few changes to the original timeline
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Time skip to the day Tia fainted
After the conference Tia fainted and was taken to the private guest room for the royal family. The saint arrived and checked on her condition, he was surprised to find that not only was she no longer infertile, but also that her body was slowly recovering and building immunity to the poison. It was at that moment that he heard vita's voice speaking to him, " My child, I know you might be surprised, however as you know this blessed child of mine was being poisoned without knowing, you have the evidence to condemn them, and don't worry. I know how much she has suffered, which is why I'm slowly healing her, your blessing will only fortify my power and make it work faster." As soon as he heard this he told the royal family and Marquis Monique about Tia's poisoning and said he would gather enough evidence. At this time Jieun had gathered enough evidence to convict duke Zena, whilst all of this happened Tia recuperated in the Monique manor and Sein and Allen constantly visited her(yes, this time he didn't help the duke). [By the way all of this happened in the span of 2 months, since I don't have the time to dwell on such things.]
Aristia recuperated and the new year's ball was prepared, since she hadn't formally submitted her request to break off the engagement. As such on the last day she would accompany him, as his fiancé. On the first day she would be accompanied by Allen, since he was now the dukes heir, on the second she'd be accompanied by Sein, and on the last by Ruve. She planned the last day of the ball, and Jieun planned the second day, The crown prince planned the first because neither of them would be his partner on that day. And Duchess Rass(cuz I forgot her name) who usually planned such events, was unable to plan it because of her pregnancy( she unexpectedly got pregnant so far along in her life, well technically she's barely 40 going 41, she had her eldest at 17, and Sein at 22) currently she's 5 months along so halfway through the pregnancy.
Time skip to the ball
On the first day she danced with Allen
After the dance they talked for a bit and finally Allen decided to speak up, "Tia… Tia" Allen kept repeating her name not daring to confess. Tia heard him is so she replied with a faint smile in her voice, " Allen, haven't you known me long enough to know you can trust me and tell me anything without having to worry about me judgemental?" She saw him tense up so she deliberately teased him reminding him of their past "… Or do you not trust me enough to tell me, even after I told you my secret years ago?" Flustered, he finally spoke up, " It's not that Tia, it's just that, I don't know how to say this." Allen was then reminded of who he was and gathered the courage to confidently say " I like you, and I know you will dissolve your engagement. I'm willing to wait for you, so would you please be "my dear lady forever"" he emphasized the last part reminding her of their promise, the one they made after reading that book after sword practice. Aristia remembered, and she became flustered, not because of the sudden memory, but rather because of the sudden confession. However she knew she couldn't lead him on, especially not now, not when she had yet to confess to her loved one, not when she was working on breaking of her engagement to her hopefully soon to be cousin in law, hopefully because she wasn't certain that Sein would accept her confession or her feelings. After pausing for what felt like an eternity, but was actually only about a minute and a half, Aristia replied, " Allen you're my dear friend, and I love you," when he heard that Allen's eyes lit up but her next words broke and burned his illusions to the ground, "but I don't like you in that way, you'll always be my friend. And I'm sorry to hurt your feelings, but I already have someone else in my heart, I still want to be your friend because you're one of the few who knows my secret. Additionally, I truly appreciate your friendship. Even though I can't reciprocate your feelings, we can still be friends, right?" Multiple emotions passed through his eyes and his face had a complex expression after a second he said, " although you may not love me, I still love you. And even if you don't reciprocate my fee, I'll stay by your side , and support you." Though based on Allen's personality, if his parents had heard, they would've thought he was lying. However at that moment he learned the true meaning of love and that if he truly loved someone, then he wouldn't and shouldn't force them. He realized that as long as she was happy he'd be happy. His words were sincere, after all he was only ever sincere when he was talking to Tia, his lady, the heir of house Monique, Aristia Pioneer La Monique.