Illyasviel and a Man on All Fours, Derpixon Style, Single character, Illyasviel, on all fours, from behind, legs spread, intimate, Derpixon style, simple cartoon, bold black outlines, vibrant flat colors, without shading, clean lines, white background, petite and slender build, smaller size, enhanced bust and gluteal size, long straight golden hair, pale skin, large red eyes, confident half-smile, elegant facial features, slightly smug expression, naked body, full body view, maximum simplicity, clean flat coloring, no complex details, no gradients, no shine. The man is behind Illyasviel, his erect penis visible and fully inserted into her vagina, his hands gripping her hips. The drawing quality is high, with detailed and smooth lines.