Numb3rs Fanfic Finders

It's me, again, (I really have to stop reading too much fics...)

Anyway, it just popped into my head. I think it's a Don/Charlie fic at the beginning. They are at some FBI family gathering at the beach or in a parc. Charlie is in swimshorts and he is talking about Colby with Don, saying how sexy he looks? I also think they invite him to join them but I'm really not sure...

Ptijade

EDIT: Found! See comments