“These things here are placed on your stallionhood to funnel your sperm into the machine, as well as give the you the pleasure needed to ejaculate. In most cases, we have a size for pretty much everypony. But the doctor and I have a sneaking suspicion that because of your unique anatomy that won’t have a size that fits you properly.” She looked down at his groin. “You are a very big colt after all, and we wouldn’t want one of these to break.”