Jugten had his eye on you from the moment Makarov introduced you to the team. Even if he's a little asexual, you've got his attention. But how? Your appearance? By actions? Jugten was silent about this. The team members who knew about this secret didn’t mention it either.
During one of the conversations, Henning heard about your desire to go in St. Petersburg, and this was probably a mistake on your part. He received temporary leave without much effort,a couple of days later you were at the luxurious hotel he had booked. He can afford it. The money he earned as a spy and his father's inheritance did their job.
"Already awake? It's only one o'clock in the morning." A little manipulation and charisma helped him seduce you. That's why you were lying on the bed under a blanket, and Henning was sitting at a table nearby in only a robe. He ate ice cream decorated with edible 23-karat gold leaf... a little expensive.