Secure Internship -> Delay Graduation -> Secure Better Internship -> What Now?

I didn’t lie to my current bank—I intended to graduate on time when I applied—but I knew if I delayed graduation a year (and leveraged this internship on the resume) I would have a better shot at IB. I did, and I got a good offer that I’ve signed.

So I have two banks, one thinking I’m a junior (rising senior) and one thinking I’m a sophomore (rising junior). 

What I’m doing now is not IB but it’s close to it. So I’m worried that if it comes out that the current bank finds out that I’m delaying graduation and going to another bank, they might be pissed and someone might go to next summer’s bank and tell them I misled them about my graduation year. Next summer’s bank thinks I’m a true sophomore and doesn’t know I’m delaying graduation a year to do this. 

I’m worried that coming clean with my current bank isn’t a good idea because of that. Even if it goes well and they aren’t too mad, someone might let something slip to next summer’s bank. I know coming clean to next summer’s bank isn’t a good idea. 

I’m thinking about just laying low this internship, saying “I don’t think this is right for me” and then continuing to lay low until (and perhaps further than) next summer. That doesn’t remove the fact that someone could get mad or suspicious or that some coincidence might just happen that causes me to lose the offer. It’s not the end of the world if I do, but I don’t want that to happen. 

At the same time though, if I came clean to my current bank, maybe at the halfway performance review point, I could manage to not make anyone too mad. 

So, how should I navigate this?