Ive put some of my thinking in parentheses. The river bet felt so wrong to call.

No-Limit Hold'em, $0.02 BB (9 handed) -

MP3 ($3.31)
CO ($1.95)
Button ($5.14)
SB ($0.98)
BB ($2)
UTG ($4.99)
UTG+1 ($0.97)
Hero (MP1) ($1.85)
MP2 ($5)

Preflop: Hero is MP1 with Ad Ah
Hero bets $0.08, MP3 calls $0.08, 4 folds
Flop: ($0.19) 3c 8h 7c

Hero bets $0.06, MP3 calls $0.06
(bet to see if he happened to make a set, if i get raised, he did)

Turn: ($0.31) 5d
Hero checks, MP3 checks
(more draws just showed up)

River: ($0.31) Qc

Hero bets $0.04, MP3 raises $0.24
Hero folds
(you made your flush didnt you??)

Total pot: $0.39