MP2 is fairly liberal preflop: highlights mainly include raising, and callling a reraise, with QJo in MP.

No read on UTG+1.

BB had a 2-buyin stack when I arrived at the table. No real strong read but he appears to go too far with 1-pair hands and has only modest regard for position.

What is most +EV (or at least, least -EV)?

PokerStars No-Limit Hold'em, $1.00 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

Hero ($107.35)
CO ($100)
Button ($100)
SB ($101.65)
BB ($142.35)
UTG ($98.35)
UTG+1 ($20)
MP1 ($57.05)
MP2 ($48)

Preflop: Hero is MP3 with , . CO posts a blind of $1. UTG+1 posts a blind of $1.
1 fold, UTG+1 (poster) checks, 1 fold, MP2 raises to $4, Hero raises to $10, 3 folds, BB calls $9, UTG+1 calls $9, MP2 calls $6.

Flop: ($41.50) , , (4 players)
BB checks, UTG+1 bets $10 (All-In), MP2 raises to $38, Hero ........?!?!