Awkward AKo UB 10/25 NL

[AZK]

Part I

Folded to me in MP/LP and I raise pot with black AK. One unknown caller calls, and a solid (on the tighter side) 2+2 lurker raises pot from blinds. We know each other from before and I think are quite familiar with each others play, I respect his play, I think it might be mutual (maybe?). I call (maybe questionable?), other guy calls. Both me and original caller have 2.5k, Solid covers.

Flop KJ9 2 diamonds (~900ish)

Solid checks...hero?