does villains line make sense

just played this hand and wanted your thoughts on villains (bb) line here and if you feel a call is justified. villain was playing 15/8 over a fairly small sample

Full Tilt Poker, $0.10/$0.25 NL Hold'em Cash Game, 9 Players

MP2: $7.05
CO: $13.70
BTN: $34.10
SB: $9.55
BB: $27
UTG: $5.15
UTG+1: $26.10
Hero (UTG+2): $26.60
MP1: $8.80

Pre-Flop: 5 5 dealt to Hero (UTG+2)
2 folds, Hero calls $0.25, MP1 folds, MP2 calls $0.25, 2 folds, SB calls $0.15, BB checks

Flop: ($1) 5 T 6 (4 Players)
SB checks, BB checks, Hero bets $1, MP2 folds, SB calls $1, BB calls $1

Turn: ($3) K (3 Players)
SB checks, BB checks, Hero bets $2.50, SB folds, BB calls $2.50

River: ($8) A (2 Players)
BB bets $8

runner runner flush?