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The System Master frustratedly had to lower himself to ally Kireina in al of this, after thinking she could be his toy to moving her into an enemy, now going back to becoming her ally was a complete circle! He felt completely and utterly pathetic to even think he had to do such a thing, but he had no other way around it, Kireina was way too incredible and awesome, and he had to lower himself to her gracefulness, especially because she had two overpowered allies- no, three, not only Flora and Aura, but Rimuru was also a formidable ally now!
He had to regretfully admit that Rimuru was now a threat, the cute slime wife that Kireina had, the one that nobody ever saw as a true threat, the one that everyone thought was a mere side character… she ended becoming such a strong Supreme Goddess! And well, eventually and with time, every single of Kireina's family members would also become formidable Supreme Gods anyways… it was a matter of time!
Check "The Protagonist's Sister Is Actually the Strongest"!