http://www.manhuaren.com/m488060/
The Case of Onodera Ritsu No. 26
Sorry but that is very unlikely. I read it in japanese but now I totally forgot the details. (If I remember correctly) this chapter shows Nao's thoughts about Ritsu like how he is serious about him, how he cares about him and he tells Takano that he's in love with Ritsu but Ritsu accidentally hears it... but man, only 40 days left. So I'm sure Nao incident will further their relationship :3
So I found the raws. Nao consults about his unrequited love with Ritsu, saying the other person won't realize his feelings becuz they're so dense/slow. Later, Nao strokes Ritsu's head while he's sleeping, saying "Really dense/slow".... and then Nao says he's in love with Ritsu in that way and Takano (afterwards) warns Ritsu to stay away from Nao and that he's not joking.
Is it a novel?