Like I was saying, beastiality isn't my buisiness. My concern is about people... and considering my area of specialty was child developement, them especially. There is no reasonable way to expect ANY child to be so inclined. Hence, always, rape. And even if it was concensual (highly unlikely), the emotional connection would be impossibly mismatched.
Now, if someone had a strange glandular thing and never left a child-like biological state, that's different. The time to mature and develop mentally and emotionally enough to handle an adult relationship is, by definition, necessary. People don't maturate to even starting that state until in their mid teens, and usually don't finish it until they're in their mid 20's... which is why relationships fail more often in the younger group. One must come to understand oneself first... and it's not fair or right to expect that of a child.
And, no, there is no reasonable way to expect a child not to come out of such a relationship with (undue) emotional damage. Probably ruining any chance of them ever having a healthy love life... but, that's just the usual chain of events, there are variations. The human mind/soul/whatever... in a lot of ways is as predictable as the human body. This is the equivilant of being tossed out of the 20th story of a building to land on the concrete below. It's not a matter of IF it will hurt, just how much.