PART 1 (Main Characters)

The story takes place where male pregnancy is no issue and its normal for anyone. Shen Wei and Yunlan are happy in their lives, but Yunlan's grandfather wants a heir now. Will they fulfil his this wish?
Please don't read if you have any issue with male pregnancy.
The story didn't contain very intimate scenes and it's my first attempt to write a story here so, support me, please.
Characters are not mine they are from ZhenHun novel by Priest and one character from Lost tomb reboot, I just borrow the characters for my imaginative story.
THANKS