NL 25: TPTK facing aggression

A hand a friend of mine played on my account:

Effective stacks are $50. My friend is UTG with AK and raises to $1. A loose passive (else unknown) calls in MP and SB (who seems loose passive (35/5/0.6 after 50 hands) calls.
Flop is As 8c 9c and pot is ~$3. SB leads for a potsized bet. My friend calls with TPTK, MP folds. Turn is Js. Pot is $9 and SB leads again for $8. My friend folds.

Standard or weak tight?

i think i'm leaning toward standard. i would minraise the flop, bet 1/2 pot on the turn, and check the river.

weak/tight...i call the turn and check/call reasonable bet on the river.
i think SB's range is AT+ 88/99, 89s, possibly A8/A9