77 with a Fish

[niko421]

U/B 3-6
Utg + 2 Semi-Loose Aggressive player
Utg + 4 Semi-Loose Passive Player.. seen him call down with as little at 22 with lots of paint on board.
UTG + 2 Raises 7h7s pre flop .. I think the raise here is loose, but this is a fairly tight game, with a few fish... I only want to play the fish.
Utg + 4 Cold calls His call tells me he has Ax or PP
everyone else folds

Flop
4c9hQh

Utg +2 Bets
Utg + 4 calls (I now put him on A4, with Ah, or PP)
Should I continue to bet and be the aggressor.

Turn
8d

Utg + 2 bets
Utg + 4 calls

River
Kh

What do I do here, bet or check, and if I check and he bets, then what? I bet and agreed to fold if re raised, because so many draws hit.

Utg + 2 bets
Utg + 4 calls