Flip the Coin [BL] - Chapter 113 - . The way back home

[Ding! Dragon Monarch System has been activated.]
Aditya finds himself in the body of a 19 years old dragon. Aditya learns the misfortune fate of the former Aditya. Being a man from the 21st century, Aditya decides to change his fate.
Being married to the 7 goddesses of this world, Aditya walks on a path to prove himself to his wives and to his family.

"Goddess of War"
"Goddess of Alchemy"
"Goddess of Wealth"
"Goddess of Wisdom"
"Goddess of Lust"
"Goddess of Music"
"Goddess of Nature"
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Disclaimer: - The image used is not mine. If the author messages me, I will take down the image.

The Demon Empire in the universe was reborn and came back! Enemies should kneel down in front of him! Beauties should lie down in front of him!

“I am a demon. I enslave gods and immortals! If you don’t succumb to me, I will convince you by force!”–Ye Feng!

Princess Leah wrote a suicide note ahead of her wedding.

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction.

He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world.

How would he use the Gundam that Long Fei created? What waves can be caused in this different world?