Beware the Possessiveness of Dragons

It's the day of the first task of the Tri-Wizard Tournament. The Champions are ready, the dragons are feisty and the audience is pumped with excitement. What could go wrong? Warning: Creature!fic/Bestiality, Dub!con, anal, Minor [Forth year, do the math] Don't read if you are squicked by any of the above. Rated M for a reason. Bottom!Harry. This will be slowly added to as ideas hit