Jellyfish Girl, or Kurage as a companion, is a monster in Monster Girl Quest: Paradox
Monsterpedia Entry
“An aquatic monster that lives in the sea. The Jellyfish Girl usually feeds by grabbing men off of boats with her tentacle; she will also capture men who have fallen into the sea. Her venomous tentacles are able to paralyze her prey so that they are unable to move as they are eaten.
Though she is able to feed by using her elastic tentacles, the Jellyfish Girl is also known to force her prey into her umbrella. Once her prey is inside her umbrella, she will squeeze his entire body and force them to ejaculate. After ensuring she has squeezed out all of his semen, she will then eat the man. With her stomach located in her umbrella, she is able to digest him as is.
Her digestive juices have extremely powerful aphrodisiac effects. She uses her juices to ensure that her prey doesn't struggle while inside her soft body.”