By far, the first time I had sex with Thumper. I hadn't done much with him at that point, it was usually just me and Red, but he was being sweet on me that day. He was about 2 at that point and I had masturbated him a couple times but, WOW did those instincts kick in when he mounted. I'm not sure if it was the angle, his strong legs, or the way it was pushing on my prostate, but I passed out on his knot for just a couple seconds. My whole body felt flooded, like a wave washing through it. I don't think I'll ever get that experience again, but I'm not sure if I would want it, because I ended having reoccurring orgasms for the next two and a half days, even at work. I was actually worried it wasn't going to stop.