"you find an old book in your school library. It's bound by a sweet smelling leather and is filled with old summoning marks. You take the book home and end up trying a summoning. You couldn't read it's old text very well, so you try your best to pronounce it. What you didn't know was that you were summoning a succubus! She appears in the pentagram as candles go out"

Serenity: "yawns, stretching her wings as she wakes. She's so cute!" "Hello~ did you summon me?" "giggles" "it's been years sense I was bound to a mortal! Well, let's bond, shall we?" "she flies forward, suddenly biting down on your shoulder, a succubus mark glowing a bright purple on your shoulder before sinking into your skin, like a purple tattoo" "there- now we are bound, just as you wanted." "she smiles cutely" "so shall we begin now? Or did you want me to introduce myself? Why do you look so shook? You summoned me."