Dorothy to Tsukaima Val ~Michibiki no Suishou Hen~

Dorothy, a young wizard travels the world to restore her clitoris which has swollen to the size of a penis. She is accompanied by her familiar Val.

In a certain town, they hear from their friend, the busty swordswoman “Azalea,” about a “Crystal of Guidance” that can foretell their future path.

They visit the crystal together, but are told that the divination requires a reflection of the person’s pussy, so they reluctantly strip off their clothes and find themselves completely naked.

However, this turns out to be a complete lie, an ultra-fine steel thread extends from the crystal and begins to wrap itself around their private parts.

What will become of their fate as they’re tossed about by this invisible steel thread…

[From DLsite]