The Queen Of Futanari
Dark gets his long tail, with the end as an arrow, puts it on my chest, on the left part, and scratches a demon-shaped sign deeply on the place where my heart is.
As I am bleeding deeply, he puts one of his horns, which was still on fire, and cauterizes the sign.
"- I must say it hurt like shit, but I didn't care after the extreme pleasure you have just given me. I tell Dark.
-My love, now we are one. We mixed our blood, I have marked you, and now we are connected for eternity. When one of us dies, we will both die. I love you with all my being! Dark replies, then kiss me intensely, swearing to me that he will make love only to me for the rest of our lives.