After Transmigrating Into an Omega, I Was Marked by the Enemy

Novel Summary
Alpha Yan Qiu bumped his head and unexpectedly transmigrated into his nemesis Ji Xinglan’s Omega fiance’s body.
【Before Marriage】
Ji Xinglan leaned lazily on the couch. “Renouncing the wedding? Impossible.”
The man smiled wickedly, overturned Yan Qiu on the sofa, and suddenly lifted his shirt.
Yan Qiu looked at his belly and suddenly felt the heavens fall and earth render! (idiom; rocked by a major disaster)
Ah, I’m through!
…Ah, I’m through! This pair of male dogs!
【After Marriage】
Inhibitors couldn’t be used during pregnancy, feverish Yan Qiu with no choice could only let Ji Xinglan repeatedly torture him.
Having to meet with my arch-nemesis is indescribable, I’m going to die!
__________
Only Ji Xinglan knew that he had never touched any Omega fiance at all.
He was going for Yan Qiu from the beginning
A few months later, Yan Qiu looked at his still flat belly, gritted his teeth and slapped Ji Xinglan’s face.
“Roll! You f*cking cheater!”
“This Laozi demands a divorce!”
Ji Xinglan smiled calmly and took out a piece of paper from the drawer.
“Sorry, honey, it’s too late. Now you really are pregnant with my seed.”
– Description from Novelupdates