Story is 8k words so I can't fit it here. Here's a small preview:

"That's what they told each other, and Matt had always thought others did the same, and that was why he'd never seen other people do the same with their siblings. Or perhaps others just didn't do that stuff, and the triplets were a unique case because of the very fact that they were, indeed, triplets and, therefore, closer than any other group of brothers out there.

Regardless of the conclusion, Matt's curiosity was reaching its peak. His heartbeat accelerated as he grew more convinced that pushing the boundaries between himself and his brothers was the only way to know how deep this mystery went. At some point, they would either stop Matt; or the truth of their private, intimate interactions would come out.

Feeling like he was in a better movie than whatever was happening on their TV Matt enacted the first step in his plan."

The Triplets' Secret

Enjoy!