An old-school, trashy pregnancy novel.
The bottom was a secret guard. In his previous life, his family was destroyed, and just as he was about to freeze to death in the snow, the Third Prince rescued him.
When he was at his lowest, the Third Prince had given him a lifeline. In return, the bottom devoted his whole life to him.
So he willingly became the Third Prince's spy, infiltrated the Crown Prince's residence, served as his bodyguard, and went to bed with him.
Though he knew he was getting above himself, he still believed the Third Prince was his soulmate.
Though he spent every night with the Crown Prince, he still thought of himself as nothing more than a plaything.
What the bottom never expected was that, on the night before the imperial edict was announced, the Third Prince would kill him, while the Crown Prince would risk his life to save him.
*
When he opened his eyes again, he had returned to the night before the Crown Prince first took him to bed.
In his previous life, the Crown Prince had no children because he wasn't attracted to women, and he had faced plenty of criticism for it.
Grateful that the Crown Prince had treated him with such care, and with no way to repay him, the bottom decided to secretly give the Crown Prince an heir.
Theme: Kindness always finds a way.