SB c-bets 18bb, Hero CO with A♦K♦

Multi-way Flop | 3-way: CO | 88bb effective | Difficulty: Tough

Players in hand: UTG (3-bettor), Hero (CO, preflop opener), BTN (called 3-bet)

Hero hand

A♦K♦

Board

8♥5♣2♠

Action so far:
Three-way 3-bet pot, flop 8♥5♣2♠
SB c-bets 18bb, Hero CO with A♦K♦

Pot: 36bb   To call: 18bb

Villain range: SB squeeze 3-bet then c-bet multi-way: QQ+, AKs, AKo. Rarely bluffs into two opponents.

Your move: