Villain is 20/20/2.5 TAG
I guess he thought I was bluffing

PokerStars No-Limit Hold'em, $0.50 BB (5 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Hero (BB) ($50.75)
UTG ($88.40)
MP ($46.25)
Button ($54.15)
SB ($74.80)

Preflop: Hero is BB with K, A
3 folds, SB bets $1.50, Hero raises to $4.50, SB calls $3

Flop: ($9) 10, 4, K (2 players)
SB checks, Hero bets $5, SB calls $5

Turn: ($19) K (2 players)
SB bets $10.50, Hero calls $10.50

River: ($40) 10 (2 players)
SB checks, Hero bets $30.75 (All-In), SB calls $30.75

Total pot: $101.50 | Rake: $2

Results:
SB mucked A, J (two pair, Kings and tens).
Hero had K, A (full house, Kings over tens).
Outcome: Hero won $99.50