I’ve never ejaculated when flaccid but have had massive amounts of precum flowing out. I’ve had sessions where I’ve been flaccid the whole time and then suddenly I’m rock hard and a few seconds later I cum on my stomach. It feels great and I lay there trying to catch my breath wondering what just happened.I have ejaculated fully flaccid using a massager. It was more of an overflow than spurting. Still felt wonderful. The fluid was warm.