w/o any reads just c/f flop
his LP opening size can be 2bb for entire range. his flatting range here has tons of Ax. your Q will also get you broke vs KTs/8Ts and just slow things down for Ax/AJ/A9/JJ/99 if he is slight competent. if he is slight competent then when he fires after your check then you are never good and his bluffing range here is low. he has position and a free turn so why ruin it when your 3b range hits that flop hard and you are never folding?

he could also be a complete donk/ but w/ no reads just assume he is at least ok.