Flopped Quads and actually got paid

I'd raised to 80c from the button, callled by the BB and SB, dream flop but I can't see it giving much action, but the SB bets the pot wow, then the BB calls, I just wasn't sure what they could have but, I have the current nuts, when the king comes the SB moves all-in and the BB follows, oh for more money on the tab, I have the BB covered but not the SB. Two draws hitting straights, not sure I would have moved all-in on that board even with the top straight, you could already be dead and was, and I wouldn't not have called with J9 and another player to act. Better spots for me.