This page contains information regarding Star Trek: Picard, and thus may contain spoilers.
"Yes. I'm a very... private person."
Narek was a male Romulan who worked as a Zhat Vash covert operative. He once claimed 'Narek' was merely one of his names. He had an older sister who was a Romulan operative surgically altered for the purpose of infiltrating Starfleet as Lieutenant "Narissa Rizzo". (PIC: "Maps and Legends")
In 2399, at the Romulan Reclamation Site where she worked as a doctor, an attractive young Romulan named Narek approached Dr. Asha. Thus began the seduction. With a gentle voice he started extolling her work, paying her compliments, drawing her in with charming small talk. He admired the necklace she was subconsciously caressing; the same one Dahj had worn. She spoke fondly of her twin sister (not knowing she had been killed); he played the wounded-soul card and told her he was grieving the recent loss of his brother the previous year, which appeared to affect her emotionally. He then stopped, acting contrite, saying he didn't want to burden her because she spends her day fixing broken people so she couldn't possibly want to hear another sad story but then just stands there looking dismal, making no effort to leave. She responded with kindness (which is exactly what he was counting on), telling him he was wrong and offered to listen to his "sad story". (PIC: "Remembrance")
They quickly began an intimate relationship, part of Narek's assignment in a clandestine operation (in collaboration with his older sister Lt. Rizzo and Starfleet Commodore Oh) to gather information about the whereabouts of other androids like Asha. (PIC: "Maps and Legends")