After having sex with you, Christopher passes out, while you grab onto your knees, and begin to get traumatized from that entire experience.
'I just had sex with my own brother,' You think, not saying anything to wake him up. 'What was Mrs. Johnson thinking? How was this suppose to help me in any way?'
Suddenly, as you got distracted, the cross on your necklace starts glowing again. 'My body feels so hot again,' You think, and look back at Christopher, who wasn't making any noise. "Brother?" You say, but suddenly feel tingly as the cross was still glowing. First your hair recedes to the crown of your head, while your breasts shrank from B-Cups, flat chested. Your butt becomes a flatter, as the transformation occurs, and you feel your demon parts change as well.
Your horns get shorter, only your demon tail stays long, it is long like a whip and it has a sharp arrow tip on it. Back with Christopher, he was still asleep, and his body is the same. You are not only completely naked but you are also now a Newborn Succubus. Naturally being a Baby, even as a Demonic Succubus, you cry.