Disclaimer: Don't own a thing. It would've been lovely, though.
Harry knew she shouldn't have kissed his best friend as an idiotic truth-or-dare challenge. They were reasonable adults, family and kids. Yet they were lightheaded and slightly drunk. Nothing terribly wrong with that. They kissed only briefly, never paying attention to it. The game continued - laughs and embarrassed sighs. Only afterwards, when they stumbled upon each other in a dark corridor of a second floor, they reached out for more. This kiss was deliberate, slow, thoughtful and inexcusable. Harry would've been happy to blame it on sudden craziness, but he was thinking clearer than ever. Hermione was as serious and intent as during her war battles. They both knew that they lost and neither of them was regretting it.