A teenage jihadist exchanged affectionate messages with a man who helped him to go to Syria in which they called each other "cutie", "honey" and "babe", a court heard.
Before going to the war-torn country, Aseel Muthana, then 17, from Cardiff, made "declarations of love" to 21-year-old Forhad Rahman, jurors were told.
The pair, who lived in different cities, had formed a "profound emotional closeness" through WhatsApp messages which they signed off with kisses, the Old Bailey was told.
Because of their relationship, Rahman knew what his friend was planning before he left his home in Christina Street for Gatwick to board a flight to Cyprus in February 2014, jurors were told.
Rahman, from Cirencester, who allegedly got a passport and paid for Aseel Muthana's plane and coach tickets, is on trial with two other men accused of preparing acts of terrorism by helping the teenager on his way to Syria.
The second defendant, Muslim convert Kristen Brekke, lived near Aseel in Cardiff. Rahman put him in touch with the third defendant Adeel Ulhaq, who gave him "valuable advice" on how to get to the war-torn country, the prosecutor said.
Brekke (19), of Pentre Street, Grangetown, Cardiff; Rahman, (21), of Cranhams Lane, Chesterton, Gloucestershire; and Ulhaq (21), of Westbourne Road, Sutton in Ashfield, Nottingham, all deny the charges against them.
The trial continues.