>>/6200/
The sigil activates a cleansing magic which will dig deep inside to look for the "core" which determines if you are able to develop succubus nature or not. If it exists, it will be activated. How this manifests later is up to you. However you can use the manifestation method posted above:
 >>/137/
and this sigil
 >>/3143/
to jump-start the formation. The form you create will start syncing with your core (if possible) and this will aid the process. Alternatively you can do the rebirthing and get a full tot-size body with succubus DNA and grow from there naturally.