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So about the 142 Billion Miles Size cap:
At level 121, lord of lust demon, height size is 38,452+ Miles.
With all the Growth Multipliers I can have, essence 43,194, Corruption 130,
Growth each max lust is around 1500 Miles. (and obviously will only keep going.)
I literally only have 3 more skills, Warrior of Duality, I can get after this level. Otherwise I got all the other skills.

Growth Multipliers: Memories Cray & Nyx, Demonic Appetite 5, Draco's Omnipotence 10, Unstoppable Expansion 10, Orgasmic growth 3, Kaleth's Fervour 10, Never-Ending Growth.

So pretty sure you're safe at the current cap of 142 Billion Miles.