stepbrother watched me masturbate and came on my feet

So the whole cum on feet thing started because my stepbrother walked in on me masturbating, and I still get flushed thinking about it. I was home alone, sprawled on the couch with my laptop, not even trying to be quiet, and I didn’t hear him come in until he was just standing there in the doorway. He didn’t say a word, just watched me with this heavy look, and my heart was pounding so hard I thought he could hear it. Instead of stopping, I kept going, slow at first, then faster, because the way he stared made my skin buzz. He stepped closer, knelt down near my feet, and started stroking himself while I finished, his breath hot against my toes. When I came, he did too, and the warm slick of it landed right across my arches and between my toes. It was messy and weirdly intimate, and neither of us moved for a second, just breathing hard, and then he wiped his mouth and left without a word. I sat there with his cum cooling on my skin, half-shocked, half-tingling, wondering what the hell just happened and why I kind of wanted it to happen again.