That idea came from a quicksandfans story involving samus, and a living slime pit that pulls her under, feeds off of lust energy, then spits her out alive and exhausted.
https://www.quicksandfans.com/bb/viewtopic.php?f=14&t=12553&p=87453&hilit=samus#... Its a bridge between the Quicksand sinking and vore realm.