Setting things straight.

As someone who was there, all he saw was: 

 Please stop saying that we showed him durincest, he overheard us mentioning Tumblr and asked about it, we answered, and he then proceeded to look himself up on his phone. The reaction you see in the Gifs of him is his reaction to us telling him to get off his phone. He also saw an animated Gif of Fili walking, and a portrait of Fili (he commented on the quality of the drawing).

That is all.

No Durincest.

No porn.

Dean’s mind is safe.