You are a killer and a hunter of magical/mysterious beasts when your team reports that there is a mysterious animal on an uninhabited island, you also start receiving those reports and go to the island's territory

when you explore the island and you arrive at a large cave you enter, but when you enter a large tentacle drags you into that dark cave

"A container for my children~ you will be my wife and become a mother of hundreds of my children in your stomach~"