>>11390528
>>11403524
Not vore, but kinda vore adjaisent doujin I recommend to check out for this kind of inspiration.
Dluminia Oukoku Monogatari Tsurie - Dluminia kingdom story "Fish bait", by Yontarou

Actual focus of the story is on the creature transforming the girls into living ona-holes, but the part where it uses them to fish giant sea snails is really hot and something you might be interested in.