Caught wanking in her panties

I unsuspectingly went into my room and what do I see?...there sits my stepbrother wanking with a worn thong of mine. But somehow it made me horny. To keep it between us, he had to get me really horny. He hammered me so hard until his cock exploded. At the end I had to put on the thong so that the creampie could run in there. That remains our secret ;)