Hot water bottle

As seen in the Korean web novel 'FFF-Class Trashero', a sexual partner (usually in the case of the main character Kang Han Soo referring to a woman), basically a 'bed warmer'.

"A beauty, whose body was ideal to be the highest-grade hot water bottle, thus shouted while looking down from the top of a majestic fortress covered by ice and snow." - FFF-Class Trashero Chapter 65

"His girlfriend, who had played the role of a hot water bottle, had disappeared, while he was kidnapped to the continents of Fantasia again." - FFF-Class Trashero Chapter 75

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