100NL, 100bb stax.

Bad/loose guy limps UTG, I limp along with A2, folds to 16/12/2 ABC nit/tag BB who checks it.

Flop ($3.40): KJ7
checks around

Turn($3.40): A
BB leads for $2.70, bad guy folds, I call.

River($8): 7
BB leads for $5, could I raise here?