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Since the birth of Alexander that Frank had been taking things easy. He didn't wanted to go around without actually spending time with his son, so he wanted to stay with him and do activities with him, if possible.
It has been approximately a week since the day the azure fox was born, as Alex had barely gone to his inner universe now that he knew he would cause his parents to worry so much. Although despite that, he still sneaked inside a few times, it happened three times in the week, two of them he went alone, and wandered inside for around an hour, horrifying his parents once more, and then the third time, he understood he had to go with them, so he invited both inside.
Strangely enough they were able to breath in this vacuum-like space, and even float without problems. Frank used hits opportunity to inspect in great detail the structure of his universe, finding out that Alex' inner space was something like a very gigantic space-themed divine realm.
Check "The Protagnist's Sister Is Actually the Strongest"!