Liara + Tali.

John Shepard had met the future Asari Councillor just as his campaign against the Reapers was beginning, on the uncharted world of Knossos. He and Liara T'Soni had quickly developed a mutual attraction, consumating their desire the night before Saren, his geth army and the Reaper fleet had attacked the Citadel. Afterwards, Sheard and Liara had begun a relationship, one that John assumed would last for the rest of his shorter human lifetime.

Unfortunately, when the ollector's killed him, Shepard had been seperated from the asari for extended periods of time. It was then that he had ended up in bed with Tali'Zorah, the quarian engineer. Though Shepard still had feelings for Liara, they were now matched by his ones for the young Admiral.

When both alien women had come together on the Normandy, during the Reaper War, there had been much tension and bad blood between them, as well as Commander Shepard. In the end, however, when things seemed bleak, the war unwinnable and thheir deaths certain, they had surrendered to their attractions, beginning a three-way sexual relaitionship.

As an asari, gender and species were never a consideration to Liara. So it seemed, were they not for Tali. While that was unusual for her species, it wasn't unusual the eagerness with which she ate the century-old blue woman out, every time the three of them fucked.

Not long after Shepard's recoveryy and the healing of his wounds, the three had married. Polygamy was generally frowned upon in Human cultures, but there were many alien cultures that practiced it with no concern.

Shepard and Liara were together the most, seeing each other nearly aevery day as the council members for their respective species. Tali, spent half her time on Rannock the Quarian homeworld, the other half with her spouses. Whenever she returned to them, they fucked as soon as it was possible to make up for lost time.