In my experience a small donk bet on 2nl means a weak to middlish hand, so I made a small raise on both streets where he donked small.
PokerStars - $0.02 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4
BTN: 111.5 BB (VPIP: 21.43, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 16)
SB: 74 BB
BB: 89 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)
UTG: 50 BB (VPIP: 26.42, PFR: 24.53, 3Bet Preflop: 20.83, Hands: 54)
MP: 33.5 BB (VPIP: 100.00, PFR: 100.00, 3Bet Preflop: -, Hands: 2)
Hero (CO): 159.5 BB
SB posts SB 0.5 BB,
BB posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Hero has A
A
fold,
fold,
Hero raises to 3 BB,
fold,
fold,
BB calls 2 BB
Flop: (6.5 BB, 2 players) K
J
7
BB bets 2 BB,
Hero raises to 7 BB,
BB calls 5 BB
Turn: (20.5 BB, 2 players) 2
BB bets 6 BB,
Hero raises to 18 BB,
BB raises to 79 BB and is all-in,
Hero calls 61 BB
River: (178.5 BB, 2 players) 7