A novice adventurer. A magical dungeon. And a slime that offers leveling up… the hard way. For my eighteenth birthday, I finally got my a spear, leather armor, and permission to enter my first dungeon. I thought I was prepared for rats, goblins, and basic slimes. I thought I knew how to grind for my first level-up. I was wrong. When I stumble into a hidden, glowing cavern, I find a monster that isn't interested in fighting. This slime is warm, luminescent, and equipped with a very specific set of tendrils. Before I can draw my weapon, it has me bound, stripped, and experiencing pleasure that defies logic. But this isn't just an attack. Every time the slime brings me to the edge, I hear the magical chime of the gods. Level up. Now I’m trapped in a cycle of overwhelming ecstasy, gaining experience faster than any adventurer in history. And the deeper the slime goes, the stronger I become. If this is how a hero levels up, I might just stay in the dungeon forever. LitRPG romance, tentacle play, eager virgin hero, monster romance, size difference, and a very sticky, extremely satisfying leveling system.