My Mistake - My Mistake trilogy part 1

Sebastian's heart pounded in his ears as he laid, tangled, amongst the sheets that he and Claude had just defiled. There had to be another explanation. Sebastian knew nothing about this, and for a centuries-old demon, that was kind of terrifying. Sebastian had to face facts.

Sitting up, he gently roused the elder demon awake, feeling ever the more nervous as he saw Claude's golden eyes bore into him.

"Claude," the younger demon whispered. "I think I'm pregnant."

I DO NOT OWN KUROSHITSUJI