Paladin, Who I Thought Was Just a Childhood Friend, Confessed His Lifelong Obsession With Me in a Secret Room of a Dungeon?!

Trapped in a dungeon room with clothing-melting slime. Together with my childhood friend… we must take action fast to get out. He confesses his obsessive love, and I lose my virginity. Years of unrequited love fulfilled. A romcom with a happy ending. (Source: DLsite)