Generate an image capturing a fleeting, candid moment on a bustling city park bench situated along a picturesque canal at sunset. An average-built man, around his mid-30s and slightly balding, sits happily on the bench, his arms stretched out and hands clasped behind his head, legs spread wide for comfort. He wears casual clothing and has a small, dark birthmark on his neck. A late-20s woman with a trim, athletic body, dressed in everyday attire, kneels on the pavement in front of him, intently performing deep oral sex on his erect penis. She looks up at him with an expression of focused pleasure, her eyes sparkling in the golden sunlight. The man gazes down at her with sheer contentment, a slight sheen of sweat on his forehead. In the background, a young, stylish couple in their early 30s stroll by, engrossed in conversation but stealing discreet glances at the explicit, yet seemingly inconspicuous, scene unfolding before them. The woman walking by playfully bites her lower lip, her eyes widening slightly as she takes in the sight. Include the gentle rustling of leaves and the soft hum of distant city sounds to create a more immersive atmosphere.