Well he could have answered the part about making babies but someone was now poking at him with one of his fingers. He didn't pull back from it and instead just allowed the poking. He seemed fully human. Perfectly solid, definitely there. Of course he was very big for a human but that wasn't the point.

"Well. I'm a spirit summoned by a mage. This is my physical form but it is the soul of the man I was when I was alive. I died centuries ago and am now spirit instead. Does that make sense?"

It was the simplest explanation honestly...