(Spoiler if you haven't gone through 38 ~ 40)...
Hmm, so; valentine episode, everyone is after Jun's hide
he surprisingly falls sick at the end, and Narumi decides to nurse him back to health.
Naturally, they look like a married couple while she is taking care of him, and they had a cool "lost, while looking at each other's eyes" sexual tension moment.
About chapter 40, let's just say homo is in the air