Rounders is wrong, slowplaying is NOT good.

Just bet out on both streets. It goes against typical logic that a very strong hand bets there (not that 25NL players have much of a thought in their head but the point remains the same), but just for the mix change it up every once in a while and check call (do this very sparringly).

I'd rather have this result:

PokerStars No-Limit Hold'em, $1.00 BB (5 handed) FTR converter on zerodivide.cx

MP ($66.90)
Button ($44.50)
Hero ($129.80)
BB ($34.80)
UTG ($149.90)

Preflop: Hero is SB with 5, 5.
1 fold, MP raises to $2, Button calls $2, Hero calls $1.50, 1 fold.

Flop: ($7) Q, 6, 5 (3 players)
Hero bets $5, MP folds, Button folds.

Final Pot: $6.65

Results in white below:
No showdown. Hero wins $12.


Than the river decision that this slowplayed set gave me:

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) FTR converter on zerodivide.cx

BB ($131.05)
UTG ($55.25)
MP ($15.60)
CO ($37.25)
Hero ($136.50)
SB ($100.85)

Preflop: Hero is Button with 4, 4.
UTG calls $1, 1 fold, CO calls $1, Hero calls $1, SB raises to $5, 1 fold, UTG calls $4, CO folds, Hero calls $4.

Flop: ($17) J, T, 4 (3 players)
SB bets $16, UTG folds, Hero calls $16.

Turn: ($49) Q (2 players)
SB bets $16, Hero calls $16.

River: ($81) 9 (2 players)
SB checks, Hero checks.

Final Pot: $81

Results in white below:
SB has As Jc (one pair, jacks).
Hero has 4d 4h (three of a kind, fours).
Outcome: Hero wins $81.