Secretly fingering and wanking with a girlfriend

I'm visiting a girlfriend at the moment and even there my horniness won't let me rest. I've waited for her to go shopping and now I just need my orgasm. My fingering slowly slides towards my cunt and I stroke myself. But a short time later, my fingering penetrates deep into my pussy and with increasingly violent movements, I twitch and have my desired orgasm. If my girlfriend had caught me, I probably wouldn't have realised it, I was so engrossed in my wanking. Have you ever been caught doing this?