Problems of the original mod:
1) Broken death animations after feeding in both the NG and Standalone versions.
2) In the Standalone version, feeding was often not recorded at all after orgasm or Ostim scene ended immediately without sucking out life.
3) The mechanics of the mod did not synergize well with the combat and social part of the game. You could literally feed on the whole Skyrim without restrictions.

Changes introduced by the Remake:
1) You no longer kill partners when feeding, instead you inflict a health debuff to the partner (not hostile, therefore you can feed from both enemies and allies), you can re-feed on the same partner after 24h. The debuff value increases with the level of succubus, lust and succubus weakness also do affect debuff value, maxed out you can inflict almost 100%.
2) All seduction spells have become daily powers. If you rely only on these powers, then you will grow as a succubus for a very long time, it is assumed that you will use other mods to start Ostim scenes, such as Amorous Adventures, ORomance Plus, Ostim Romance, etc.
3) Lust spell raise arousal depending on Succubus level and current energy ( If OSLAroused installed ).
4) Added leveled buff to player character after his/her orgasm.
5) Removed healthBars UI during orgasm (Since remake they don't give much of information anyway and sometimes can be confusing)
6) Lust spell now uses small amount of Succubus' energy

Credits:
Author of original A Succubus' Tale is CaptainHubs, so if you like this mod, go give thanks to him first
His mod: A Succubus' Tale