UTG: 751,384 (15 bb)

MP: 2,101,419 (42 bb)

CO: 1,529,399 (30.6 bb)

BTN: 1,737,704 (34.8 bb)

SB: 2,034,941 (40.7 bb)

BB: 2,216,284 (44.3 bb) hero 9c Ts

Preflop:
4 folds, SB raises to 125,000, BB calls 75,000

Flop: (287,500) 3 J Q (2 players)
SB bets 125,000, BB calls 125,000

Turn: (537,500) A (2 players)
SB bets 318,625, BB raises to 1,960,034 and is all-in, SB calls 1,460,066 and is all-in

River: (4,094,882) A (2 players, 2 are all-in) 

Results: 4,094,882 pot
Final Board: 3 J Q A A
SB showed Q A and won 4,094,882 (2,059,941 net)
BB showed 9 T and lost (-2,034,941 net)

I started railing my friend a couple hands ago. Dont have reads despite villain is a good mid stakes reg. I personaly hate the shove otr but iam a fish and i might being results oriented. Cant imagine a dynamic that leads me to do something like this. Where am i wrong?