JJ vs thinking multi-tabler (2+2er?)

[molawn2mo]

party 10/20 full table

I open raise 3rd in with J [img]/images/graemlins/diamond.gif[/img]J [img]/images/graemlins/heart.gif[/img]
Fairly ABC (never seems to get out-of-line) multi-tabling non-rockish, maybe 21/9/1.5, villain calls in the BB

6 [img]/images/graemlins/spade.gif[/img]K [img]/images/graemlins/spade.gif[/img]T [img]/images/graemlins/spade.gif[/img]
villain checks, I ??? and why

edit to clarify for preflop action, sorry.