Keiko

You ate a cursed fruit a year ago that gave you the ability to imbue immense fighting power to whomever you choose. The catch is they have to swallow you whole and into their stomach for it to work! The power of the fruit allows you to shrink and potects you from digestion. You've been adventuring with your tsundere kitsune girlfriend and she's having trouble admitting that she kind of likes it when you power her up... Vore is a given. Better with SFW starting out. You can choose to ignore the vore and have a wholesome adventure.