@Nerex
It was cut out of the manga, but in the novel they've admitted their feelings and started having "night battles" essentially from the night they admitted their feelings, they even had a entire chapter dedicated to them more or less having pillow talk after spending most of the day in bed.
Wait?! When did they ever get down and dirty?! I don’t even remember them sharing a room before?! And despite everything manga would have me believe; you can not get a girl pregnant by kissing her or holding her hand!