How Kasumi comforts Tali after Utukku, by reminding her of how Keiji left her
Kasumi:The last message Keiji ever left me told me that he wanted me to go on. To be happy once he was gone. He knew when he recorded it that he'd likely be dead within hours, but that was what mattered to him. To tell me to be happy because he loved me. If Shepard could have done so... I know his message to you would have been the same.
Thane comforting Tali during the siege of the Citadel while trying to talk her out of burying her emotions like Thane did after his wife died.
Thane: "Only that the pain you feel is familiar to me. I know you wish to shut it out. To take revenge for his death. But I do not believe Shepard would have wanted that path for you. And as one who experienced it... I would agree."
Shepard taking some time to pet Urz after the battle for the Citadel. That section is seen from Urz's POV, and he's very happy to have his pack back together.
Tali and Shepard's Big Damn Kiss at the conclusion of the Rannoch arc.