Discovered my stepson masturbating and allowed him to ejaculate on my buttocks while wearing denim

As I casually strolled into the room, I caught my stepson in a rather compromising position. He was pleasuring himself, his hand moving rhythmically over his throbbing manhood. Initially, I was taken aback, but then something strange overtook me. I found myself wanting to be part of the action. I stripped down, revealing my tight denim jeans-clad ass to him. His eyes widened at the sight, and I could see the anticipation in them. He rushed over, his hand enveloping his rock-hard cock as he stroked it frantically. The climax was imminent, and he directed it straight at my buttocks. The denim fabric was no match for his hot load, which soaked through, leaving me tingling with pleasure. This was a whole new level of family fun, and I couldn't help but crave more.