Stepbro's Secret: Caught Jerking and Dry Humping My Juicy Ass

I walked in on my stepbro secretly jerking off — he got all flustered, but I couldn't oppose teasing him. I offered him my big, soft ass to grind on — fully clothed, of course. He started humping me like crazy, and the way his bulge pressed against me... it drove me wild. I ended up cumming hard just from his desperate dry thrusts.