About Iruka and Shinju
Tension between Irushi:
1. Iruka has some serious problems with Shinju's reserved attitude in romantic/erotic settings. She doesn't show many emotions or signals which makes Iruka frustrated. He always has to guess if she likes it or not, most of the time she's natural and more concerned about pleasing Iruka instead of enjoying herself. Often their romantic/erotic moments are disturbed by little arguments about who pleasing who and, if Shinju gives in and enjoys these moments together, Iruka would often spoil these moments by saying something snarky about her opening up at last, which would turn Shinju off.
2. Shinj