AK suited in BB (Preflop Question)

[Mercman572]

100NL 6M, I've been sitting for 15 hands

UTG (50/20 ish) raises 5BB
Btn 14/0 (But I've seen him around this week on my other comp and he's this tight usually) calls.
SB folds. My move? I feel reraising is bad since my good flops will be very obvious, but UTG's raising standards may be very loose and the BTN may be set mining.