Bet into again, a pretty common situation

[Perseus]

This has been happening quite a bit lately, and I'm starting to question the standard line I take in this spot.

So, I figured I'd throw it out to you guys, oh wise 2+2ers...

Party 2/4

I am in MP3 with AsJs. Guy before me limps, and he is unknown. I raise. Button is a 24/10/.5 and cold calls. SB is a 23/14/1.5 and cold calls. Folded to MP2 who calls.

Flop comes 6c6s7c

MP2 bets into me.

What's my plan and why?