(Two images: left, Rei from Oniisama e sits in a dark room and smokes. Right, Kaoru from Oniisama e sits in the same dark room and smokes.)
So early in the series we meet Rei, hanging out in her favourite dark corner like the seekrit french poet that she is, deep in her soul. Late in the series, after Many Dramatic Events Have Transpired, we have Kaoru, who is at the point this screencap was taking having an episode of longing after lost heterosexual love. She does this, amongst other things, by going and sitting in Rei’s favorite spot and smoking a cigarette or three while thinking longingly about her. IF ONLY SHE WERE HERE. WITH ME.
Completely heterosexual goings on. Completely. Definitely not the stuff that femslash is made of.