$10 NLHE 6-max: blinds

Full Tilt, $0.05/$0.10 No Limit Hold'em Cash, Rush, 6 Players

BTN: $17.21 (172.1 bb)
SB: $20.17 (201.7 bb)
Hero (BB): $15 (150 bb)
UTG: $8.86 (88.6 bb)
MP: $4.70 (47 bb)
CO: $10.46 (104.6 bb)

Preflop: Hero is BB with J 8
4 folds, SB raises to $0.30, Hero calls $0.20

Flop: ($0.60) 8 3 2 (2 players)
SB bets $0.40, Hero calls $0.40

Turn: ($1.40) K (2 players)
SB bets $1, Hero calls $1

River: ($3.40) 8 (2 players)
SB checks, Hero bets $2.50, SB calls $2.50

Info on our opponent:
First question is about preflop. Since our friend doesn't like folding to 3bets + we are deeper we are left with 2 options? Given the fact that he is one the wider side + we are in position we have a call ?

Nothing much to say about flop

He could use this (scare)card for barreling. Since its King of spades we aren't going anywhere yet? What if it was non spade? We still call?

River sizing is good?

Well played - No sense in 3betting this pre. Would have played every street the same. River sizing seems fine to me.

Standard all the way around. If it was a non-spade, you'd still call.

Thanks for replies