Drawing 2 up front in limit draw

[schubes]

As an attempt to create 5 draw discussion outside of the "Advice for draw poker online" thread, what do you think of this hand?

4 handed 5/10

Button is a little too loose, and aggressive after the draw. He open limps often, and loves to limp reraise his better hands.
BB hasn't played many hands and seems straightforward in the hands he does play.

I have TTTJ6 in SB

fold, Button limps, I raise, BB 3-bets, Button caps, call, call...

I discard 2 (?), BB discards 2, Button discards 1...

No help, TTT76

I check, BB checks, Button bets, I raise (?), fold, call.