Pacific, $0.25/$0.50 No Limit Hold'em Cash, 4 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

SB: $20.50 (41 bb)
Hero (BB): $57.85 (115.7 bb)
CO: $169.13 (338.3 bb)
BTN: $83.52 (167 bb)

Preflop: Hero is BB with K Q
CO folds, BTN raises to $1.50, SB folds, Hero calls $1

Flop: ($3.25) 2 A 4 (2 players)
Hero checks, BTN bets $1.50, Hero calls $1.50

Turn: ($6.25) 6 (2 players)
Hero checks, BTN bets $4.50, Hero raises to $11.70, BTN raises to $22.76, Hero calls $11.06

River: ($51.77) 8 (2 players)
Hero bets $32.09 and is all-in, BTN calls $32.09

The opponent is aggressive reg. I decided bets on the river because I almost don't have bluffs in this situation and my hand after bet/call turn looks like flush dro or weak two pairs, but I won't to bet with two pairs. Can he fold here two pairs or set?