Genos can tell when his Master is having one of his good mental health days, and today is exceptionally good.
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For once, it’s nice inside Saitama’s apartment despite the scorching heatwave. But Saitama and Genos aren’t the only ones happy about it.
Genos has an improved attachment. Saitama might be a little too happy about it, though.
A misunderstanding leads to good time, or “You just had to say so, Master”.
They’re not doing anything important behind closed doors.
Genos is a cyborg. Adding a bodypart is nothing to him.