Source: https://www.dlsite.com/maniax/work/=/product_id/RJ325621.html

Summary:
サキュバスちゃんが魔女っ娘のルミちゃんを丸呑みにするためにあれこれする話です!
丸呑みメインとなります。

※流血描写、切断描写はありません。ソフト丸呑みです!

A story about how a succubus secretly plots to gobble up a witch named Luma.

* There is no blood or gore here. It's all Soft Vore!

Table of contents:
pages 2 - 11, Outmatched by a low-level monster... The succubus girl collapses in defeat.
pages 12 - 22, Sick a giant spider on her!? Wrapped up tight in spider silk.
pages 23 - 33, A scheme to weaken her by having a sand-worm attack, then swooping in to "rescue" her!!
(Really a trick to get the witch into inhaling aphrodisiacs.)
pages 34 - 46, Foreplay before the big gulp: Teasing and tormenting the witch!
pages 47-53, It all leads to this moment! Swallowing the witch whole!!
pages 54-58, Now helpless inside of the Succubus's tail, the witch can not escape it's pleasure.
pages 59-67, A Moment of Bliss.
pages 70-74, Omake 1
pages 76-90, Omake 2.