Big Sean, Jhene Aiko Might Be Back Together Post-'None of Your Concern'

Big Sean and Jhene Aiko's on-again, off-again relationship appears to be very much so back on after they released a super personal song with a little TMI attached.

The rapper and singer -- who've dated and broken up at least a couple different times over the past few years -- were spotted grabbing dinner in Malibu Saturday at a fancy place called Geoffrey's ... where they looked like more than just friends and collaborators.

TMZ obtained photos of Jhene sitting on Sean's lap at one point as they looked out at the ocean on the restaurant's patio deck. He's holding her pretty tenderly too, BTW.

This, of course, is a major development considering the new song they released together Thursday. JA's single, "None of Your Concern," caught fans off guard with a Big Sean feature.

The song is incredibly introspective, and touches on their relationship ... and a big takeaway from Sean's verse was how he pleases his lady in the bedroom. Apparently, he once made Jhene orgasm 9 times in a day -- and he doesn't think any average Joe deserves her.

Well ... it certainly seems the collab might've brought 'em closer than ever -- 'cause the homie-lover-friend wheel they often spin seems to be on the lover corner right about now.

Oh, and if you're wondering who picked up the tab during this intimate meal ... it looks like BS did, as he's seen signing off on the bill here. Good man right there.