[ Cisco's expression is definitely surprised, when Taako drops that little bombshell about robbing the guy's house. It's not like Taako hadn't mentioned stealing stuff before, but it surprises Cisco that he would steal from someone he'd actually interacted with. Maybe being confused for his sister was a little more hurtful than he'd let on. ]

Hey man, I'm not a narc. I won't bring it up, but also like... you've seen me lie. [ Cisco raises his eyebrows significantly; he doubts there is any need for him to remind Taako just how bad he is at hiding things when he is specifically confronted about them. Avoidance, denial, he's got that in hand, but when it comes to actual on the spot deception? Not his strong suit by a mile. ] So... take promise with some grains of salt.

[ He wants to add something to the effect of I don't like keeping secrets, but he can't seem to make himself say it, which is yet another somewhat unflattering little glimpse at his own psyche. Did he really like keeping secrets? Is he really someone who enjoys that? He doesn't want to be. ]

I mean, it's not like I've never broken a law before.

[ There are some rules out there that Cisco is willing to break, and others that he's willing to bend. He's neutral good not afraid to make exceptions like hacking into sealed police files, or even locking up metahumans in the pipeline until Iron Heights was outfitted in a way that could handle them. ]