25/50 I have a set, river 4 flushes and I call?

[Stinger88]

First the hand

PokerStars Game #11702263380: Hold'em No Limit ($25/$50) - 2007/08/26 - 13:08:28 (ET)
Table 'Dembowska' 9-max Seat #5 is the button
Seat 1: $tinger 88 ($4950 in chips)
Seat 4: louisianaboi ($2896 in chips)
Seat 5: sweetluvin7 ($3788.50 in chips)
$tinger 88: posts small blind $25
LittleZen: is sitting out
louisianaboi: posts big blind $50
*** HOLE CARDS ***
Dealt to $tinger 88 [9c 9h]
LittleZen leaves the table
sweetluvin7: raises $100 to $150
$tinger 88: raises $350 to $500
louisianaboi: folds
sweetluvin7: calls $350
*** FLOP *** [2s As 4s]
$tinger 88: checks
sweetluvin7: checks
*** TURN *** [2s As 4s] [9d]
$tinger 88: bets $750
sweetluvin7: calls $750
*** RIVER *** [2s As 4s 9d] [Ts]
$tinger 88: checks
sweetluvin7: bets $2538.50 and is all-in
$tinger 88: calls $2538.50


Now my thoughts - I'm putting him on a weakish ace here. I think this range is skewed toward suited aces because he may fold weak offsuit aces preflop. I think he'd check back Ax7s on the river or at least bet smaller, and I really don't see KsJx or something taking this line. Thus, I call. Thoughts?