bet-sizing in two simple spots, 10nl

cheers to vinland for the thread inspiration

Villain is 31/7/1.3 loose passive with a 70% fold to cbet

Party Poker No-Limit Hold'em, $0.10 BB (8 handed) - Party-Poker Converter Tool from FlopTurnRiver.com
UTG+1 ($11.90)
MP1 ($12.62)
MP2 ($6.62)
Hero (CO) ($10.15)
Button ($11.18)
SB ($10.27)
BB ($9.85)
villain (UTG) ($9.32)
Preflop: Hero is CO with 10, 9
villain calls $0.10, 3 folds, Hero bets $0.45, 3 folds, villain calls $0.35
Flop: ($1.05) 4, 5, A (2 players)
villain checks, Hero bets ?

SB is 10/5/2.7 with 100% fold to steal over 103 hands. BB is 13/9/4.5 with 84% fold to steal over 548 hands

No-Limit Hold'em, $0.10 BB (7 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com
UTG ($21.87)
MP1 ($3)
MP2 ($14.57)
CO ($10)
Hero (Button) ($15.65)
SB ($8.81)
villain (BB) ($9.97)
Preflop: Hero is Button with J, 8
4 folds, Hero bets $0.26, 1 fold, villain calls $0.16
Flop: ($0.89) 4, 5, 2 (2 players)
villain checks, Hero bets ?