Skeleton Knight, in Another World - Chapter 7Volume 6 -

Three years into Qin Yu's marriage, his wife and in-laws all hated him.

Lin Wanwan slips a jade bracelet onto her wrist—and steps between two worlds.Side A: neon lights, 5G, instant ramen, MRI machines—an age of abundance where food is fast and friendships sometimes slow.Side B: Tang-dynasty sunshine, cracked earth, locust clouds, emperors who ask villagers to skip meals so soldiers can march. A “golden age” that growls with hunger.Lin has no grand plan—only a wish:let the little bean who waits for her at the gate eat his fill,let the gray-haired elders who calls her “treasure” sleep without fear of famine.Lin Wanwan wants to bring small changes to the world she loves, so the family she cherishes can live a little better, then a little better still—because“I has finally found the place that calls my home.”

In the era of interstellar warfare, every melee mech will be paired with a long-range sniper mech to cover the battle.
The sniper mecha master Yan Xueshan (beta) and the melee mecha master Arthur (alpha) are just such a pair. The two have been together for six years.
The upcoming Armageddon is a near-death battle.
the day before.
Yan Xueshan: “Remember to write a suicide note in advance.”
Arthur said frustratedly: “I have only one regret. If I die this time, I will be a virgin until I die.”
Yan Xueshan snorted coldly: “…no promise.”
Arthur asked pitifully, “Master, can you fulfill my dying wish??”
Yan Xueshan: “?”
How absurd.
But Yan Xueshan thought about it, this is his comrade-in-arms, whose life and death intersect, chastity counts as a p- OK, I agreed! !
However, after the Armageddon, none of them died.
Not only did they become war heroes, Arthur also turned into a federal prince.
Arthur took out the marriage application, just one signature, and said honestly and faithfully: “Master, didn’t you say that you will go back to get married and retire after this battle? You help me fulfill my wish, and I will help you fulfill my wish too!”
Yan Xueshan: … something seems to be wrong?

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Search keywords: Protagonist: Yan Xueshan, Arthur ┃ Supporting role: ┃ Others:

- Description from novelbuddy

Ye Kai was born with a weak body, spending his days with his mother and sister. on such a day he heard a ding voice and got Unlimited Item Shop System, where he can buy anything.The first thing Ye Kai buys from his Unlimited Item Shop System is Lust System, to make his fantasy true, where he is having sex with his mother and sisters.---The story is slow-paced so I will increase the pace from Dark Sky City Arc, so someone doesn't like slow paces then read it till the Dark Sky City ArcThird, if you think MC is beta then it's only in front of his mother, otherwise, he doesn't care about other people except for his family, and he is...pretty much ruthless towards the people.