Explicit 1990s retro hentai anime cel screenshot illustrating the theme "Secret visit to the office of the Royal Alchemist". Vintage 90s OVA anime style, hand-drawn aesthetic, rich saturated colors with dark moody ink lines. Inside a dimly lit stone castle laboratory, the Royal Alchemist is lying flat on his back on an alchemy table, wearing a historical Renaissance black velvet doublet jacket with padded shoulders and gold trim. A stunning 25-year-old Queen sits on top of him facing away, riding him in a reverse cowgirl position. She wears only a golden diadem on her head, with long silky green hair and highly detailed luminous amber eyes with retro anime sparkles. Her hands are braced flat on his chest for balance, while his hands firmly grip her hips, ensuring anatomically correct hand placement. The explicit penetration scene clearly shows his massive erect penis deeply inserting into her wet vagina, with detailed fluid splashes and exaggerated 90s vintage sexual anatomy. In the sharp close-up foreground, a glass chemical vial sits on a wooden workbench with the handwritten label "viagratus". Background with cluttered shelves of glowing potions and stone walls, vintage grain, volumetric shadows, masterpiece.