Glancing throughout the scripts to find Seranna's chance to enable the player a vampire or not, I found this one script called dlc1vampireturnscript. Does anyone know here that's the only script I need to use in order to allow the dialogue to show and give the option to the player whether they wish to be a vampire or not?

Or is it not that simple and that i'll have to script out my own dialogue in order to have the NPC turn the player into a vampire?