I didn't romance any character in the first two games, but romanced Liara in the last part.
Now, I found Garrus and Tali kissing in the main gun calibration room and wondered if there are any other intra-squad member romance scenes? For example, would Garrus be with Liara if I had romanced Tali instead? Would Tali be with Liara if I romanced Garrus as a FemShep?
I'm not interested only in this trio, but curious in general: which teammates romance each other in Mass Effect?