(4) Aquatic monodrama (Patreon)

The trapdoor opens as she struggles to swim towards it. She's quickly running out of strength, and the way up seems to be her only way out.

What she doesn't realise is that something else is following her... eventually grabbing her ankle and pulling her back into the room... and revealing itself to be another Sparkle!

The situation doesn't look good for her, as she seems to have the upper hand.