[Crossover] Nonflammable Waste

Ash is an undead. He can't die, can't grow old, and can get up to all sorts of mischief without consequence. Driven by his obsession with kindling the flame, he always wants to burn everyone he takes a liking to. Fortunately, the people he likes are no ordinary folk. When he sees Captain America: “Hey, you're a real catch! Want to come help us kindle the flame?” Captain America: “Kindle the flame?” Ash: “It means burning you to ashes.” Captain America: “...I'll pass.” When he sees 5T5: “Hey, you're great too! Want to help me kindle the flame?” 5T5: “Sure! Let me kill you for real first, then I'll go.” Ash: “...? I'll pass.” When he sees some golden-haired guy: “Come kindle, ” King of Uruk: “Burn him! He can't die anyway, so we might as well use him as a perpetual-motion machine!” Ash: “!???” No CP The male lead has a rather unusual outlook on life and wants to burn everyone he likes. Luckily, the people he likes are no ordinary folk. Theme: Praise the sun!