PokerStars - $20+$2|40/80 NL - Holdem - 9 players
Hand converted by PokerTracker 4

UTG+1: 122.75 BB (VPIP: 18.18, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 11)
MP: 199.1 BB (VPIP: 25.00, PFR: 4.17, 3Bet Preflop: 0.00, Hands: 24)
MP+1: 158.31 BB (VPIP: 53.06, PFR: 25.00, 3Bet Preflop: 4.76, Hands: 49)
MP+2: 145.65 BB (VPIP: 12.33, PFR: 9.59, 3Bet Preflop: 2.63, Hands: 73)
CO: 140.1 BB (VPIP: 19.15, PFR: 10.64, 3Bet Preflop: 4.00, Hands: 47)
Hero (BTN): 117.44 BB
SB: 107.93 BB (VPIP: 20.41, PFR: 12.24, 3Bet Preflop: 0.00, Hands: 49)
BB: 147.53 BB (VPIP: 37.50, PFR: 20.83, 3Bet Preflop: 5.00, Hands: 49)
UTG: 118.45 BB (VPIP: 17.39, PFR: 4.35, 3Bet Preflop: 0.00, Hands: 23)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 8 8

fold, UTG+1 raises to 2.5 BB, fold, MP+1 calls 2.5 BB, fold, CO calls 2.5 BB, Hero calls 2.5 BB, SB calls 2 BB, fold

Flop: (13.5 BB, 5 players) 4 8 7
SB checks, UTG+1 bets 13.5 BB, fold, fold, Hero calls 13.5 BB, fold

Turn: (40.5 BB, 2 players) A
UTG+1 checks, Hero checks

River: (40.5 BB, 2 players) J
UTG+1 bets 20.25 BB, Hero raises to 49 BB, UTG+1 calls 28.75 BB

Might just r/gii on flop, villains who are cbetting pot 5 way generally aren't going to be folding to a raise in this spot. As played turn is interesting, would prob continue building a pot. We should be expected to check back AsXs we have on turn a decent amount (makes our bet look little bluffier), if villain has AsXs which will be the case a fair amount villain certainly is not c/f. Perhaps we could check back our XsXs when we have that since we can still bomb the river and get bunch of folds when villain checks but honestly just not giving villain that much credit after flop action so would prob bet pretty much all of my value range, ~15bb. River is good but bigger is better, 55-58bb, 60+ vs some villains with right dynamic/reads.

Allin on river . Best size for your value and bluffs

Yeah maxing out on value on the flop might be best vs opponents incapable of folding. On the turn, checking our nut hands seems ok if we want to show down a lot vs a bet/check/bet line. I think bet is probably > check though.

Jesus his KK is a train wreck.

3-betting preflop would be terrible. Playing the pp multiway in position is great, and you don't know what to do if 4-bet.

Raise flop on wettish board for value and protection. Lots of bad turn cards for you. Also, he potted the flop, so the chances are good he has a strong hand; probably an overpair, but he could have a strong draw or worse set.

Bet turn. When he checks the turn, he almost always has something, as he would barrel air when the ace hit.

OP played it worse, but not well played by either player.