Master sleuths + magnifying glasses
With the drama CD and Genos giving his senpai cookies and stuff like some sappy rom com, maybe, we could get, Saitama making Genos a simple little bento to show his thanks for the cookies? And for possibly being one of the few students to be nice to him and spend time with him and Genos takes it as a confession? And Saitama doesn't know why his kouhai's face is so red and WHY IS HE CRYING DID HE DO SOMETHING WRONG!? WHY IS GENOS HUGGING HIM AND SAYING HE'S AMAZING WHEN HE HAS AWFUL GRADES!?!