Mine is twitching too and getting hard, I might just have to get out my big dildo and stick it onto the glass coffee table and have a bit of a good hard bouncing session on it lol
I recommend you do it and I think you will absolutely love it when you squat down over a big thick dildo and manage to ride it all the way down to the bottom and then start bouncing up and down on it from the top to the bottom it's the most amazing feeling and hard to describe how good it...
I have got a big thick nine inch dildo with a rubber sucker on the bottom and I stick it on the glass coffee table and ride it and it feels absolutely fantastic when I am bouncing up and down on it from the top to the bottom sometimes wish it was a real one lol