Ch 457-459 Feigned Illness arc. Kagura ends up in the hospital and finds it a good opportunity to teach them a lesson. Sougo is the only one who notices she is faking her illness, and uses this to teach her a lesson.
Sougo: If the boss and gang really care about you, they should notice before long, right? (before she is cremated and killed off, whoops, guiz)
You can interpret it as him being a sadist (he does arrange for her funeral casket to be a tanning bed to cook up Kagura lol), or him knowing exactly what he is implying. He's still the only one who noticed her very-much-alive condition.
Ch 465, pg 10. Shinigami arc. It's a major shiptease because he jokingly proposes to her; the house he is offering her is jail.
Shinpachi: We're damned if we do, damned if we don't thanks to that idiot! (he's talking about Gin's crimes as Shiroyasha)
Kagura: Seriously. I will never become a bride now, yes? (lit. "take my hand to be their bride." It's a play on how wives should be pure upon wedding day, not publicly labeled as a criminal and thus thinking no respectable guy would want her)
Okita: You can be my wife. (lit. something like 'give her hand to him' though in another translation, it says "Well, I guess I'll take ya then.")
Okita: You can live comfortably in my place with three square meals a day. (lit. three meals are included and lit. my home is ready/prepared/available)
It's a quaint house...It even comes with a little iron bar fence.
Hijikata: Consider yourselves under arrest. Dock 'cause we're boarding.
Reference:
http://forums.yorozuyasoul.com/index.php?topic=2127.msg54989#msg54989