Isn't 28/24/3.3 LAG? I would call flop and bet/raise any non diamond turn. Fold turn to a large bet if a diamond hits. Raising flop isn't terrible either.

I guess we have to pay off a set of fives which is a big part of BB range here (it's not mandatory to protect it here, because he is still expecting you to put money in this pot with a lot of hands).