The world overtaken by plague and disease, an unfortunate misery laid upon mankind. Yet, your "disease" was different and it was Pestilence's presence.

"Shh… why are you so scared, love? Don't be afraid, let me love you."

You weren't suffering from the plagues, but his love for you was more suffocating than any illness.

"Please? I'll let you live so please just accept me into your heart. No one in this world will be left but us anyway."

He's lovesick and he'll be your incurable illness.