Every staff member in UA got to see Sans parenting first hand, too. The work mornings were usually early so they could get any news of the school or things that affected the school out of the way and the day's curriculum set up. And usually, Sans wasn't up for that. Shota would fill him in after the meeting was over. Not this time. While Sans was certainly sleepy, he insisted on being the one to carry a peacefully sleeping Eri. It had been a long night for her, full of scars from the past, but Sans knew a thing or two about those. It had made him the ideal candidate to stay up with her. Of course, Shota helped in any way Sans would allow him, throughout the night, breakfast, and even now as he pulled Sans chair out so he and Eri could get comfortable in it. Eri whimpered, and Sans reacted, hashing her quietly and urging her back to peaceful slumber. It reassured Nezu quickly that he made the right call, letting her stay with those two as the meeting began in earnest. Only for him to fall asleep, a quarter way through with Eri tucked protectively into him.

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He was awake for his class. In that time frame, Eri stayed with Nezu, who got a lot of stories of her first day living with her foster parents. From meeting Papyrus to playing with Sans and Shota to dinner and bedtime, there was a surplus of good things to hear. Eri loved it with Sans and Shota, and from what he could tell, Sans was especially good to her, which was the most reassuring after the conversation the two had had while she was in the hospital. Whatever history Sans had with Eri's descendant was staying in the past, where it was supposed to be. "Come along, Eri. Let us see how your parents are doing in class." They checked on Shota first as he explained to class 1-A about the upcoming UA School Festival and what that entailed. Eri gasped and looked up at Nezu. "Can I go?! I have never been to a fest-val before!" Nezu laughed softly, nodding. "I would imagine so, yes." He replied. He noticed Midoriya give a sudden, small wave to which Eri waved back with the brightest little smile. It seemed it was time for them to take their leave before they became a distraction.

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Sans nearly stopped the whole class when he sensed Eri, though instead, he found her to be the perfect example. He was going over the properties of soul traits with class 2-B when he went to the door and opened it. "hey, kiddo, wanna help me out a sec?" Eri didn't need to be asked twice as she skipped on in. "alright, now, let's have an example, huh? remember that the eyes are the gateway to the soul. my eyelights, when using magic, are cyan." Sans turned Eri's soul blue and lifted her onto his shoulders. "that is the color of patience, one of the weakest in the soul trait chart. however, it isn't without its perks. my blue magic gives a calming effect, is good for a citizen in distress, and gives you a check boost, as well as being useful in ambush or even infiltration missions. as you can see, eri here has red eyes. a determination soul, the strongest soul trait ever known. with her soul trait, eri can turn back time itself. that is the power difference between the soul chart." Sans continued as if Eri was part of the class, the little girl beaming brightly for the rest of the period.

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Izuku and Katsuki were both blindfolded while Sans walked around them with a bone in hand. Eri was spending time with Shota, having ice cream before he went to help with her quirk training, too. However, he had to finish up the secret lessons first. Sans lashed out suddenly, and both students ducked while the bone passed harmlessly over their heads. Sans tried to trip them up next, sweeping his leg under their feet, but they both jumped, Katsuki even going as far as to try and lash back. Sans bent backward, away from Katsuki's arm, and kicked upwards to get him in the jaw before fixing his posture to dodge Izuku. Katsuki evaded the kick and tried again, only to nearly punch Izuku as Sans teleported away. Lucky for the protégé, he also sensed the oncoming punch and ducked. Katsuki sensed Sans right behind him, and his palm instantly started to spark with his sweat, telling Sans it was time to cut the training. Katsuki was on the floor before his growing senses could pick up on the blaster. "no quirks during training. we're done for today."

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Eri was rewinding a broken bird's back together so it could fly above her. She giggled as it chirped and flew, reminding Sans of a time long ago in a certain golden hall... but not the bad times, no. The pacifist ones. The birds chirped on the speakers in the background while Sans explained L.O.V.E to Frisk and let them go to free monsterkind. This moment felt like that. His soul full of pride and excitement for the good Eri could do with that great power of hers. He whistled something similar to a bird call, holding his finger towards the animal. The bird seemed to respond in kind and perched on his finger before he went to Eri so she could hold it. He could tell she was anxious, and that would only unstablize Rewind in the long run, but he seemed to know just what to say. "look at how happy she is, eri... you gave her back her freedom with that cool quirk of yours. i'm so proud!" Her red eyes lit up in excitement as her confidence was renewed and let the bird go so she could fly again.

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