Shuraka is a bit of a manipulator. I don't know if this is an innate trait or if it stems from what Shuraka had to endure during the struggle for the throne.
(I'm not saying that this makes Shuraka a bad person, it's just his character trait.)
He ignores questions and topics that are uncomfortable for him, or even deceives them. He most likely does this for some good reason, but that doesn't make things any easier for those he manipulates.
Tei asks him point-blank: "Did you spend last night with one of your concubines?"
Shuraka replies: "My nights are meaningless without you....I was too busy to spend the night with you yesterday.... but henceforth.... Beloved.... I love you..."
He doesn't say, "No, I didn't spend last night with a concubine." He doesn't say what he was doing last night.
And this is not the first time that Shuraka has done this:
1)He tricked Tei into leaving Arnata.
(maybe this is how he wanted to protect Tei)
2)He didn't warn him of his arrival in Leracal.
(maybe he was protecting Tei's safety or was afraid that Tei would refuse to meet him.)
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my favorite bl: Dawn of the Dragon (there's a real dragon in it)