villain house mate
In which King (or whoever) comes over to visit Saitama, when Sonic emerges from the bedroom. Obviously just having woken up he heads directly to the kitchen. His presence stuns the visitor they are speachless. Saitama is just all chill about having the villain in his home and explains he is living with him and Genos.
Somehow or another the Hero Association catches wind of this and initially is not cool with this. They send either Amai Mask or Flash to investigate the situation. Genos is not happy about the new arrangement but also not opposed to it. Saitama doesn't see a problem with it and Sonic is a snarky, smug, flirt about them being in the same house.
+sonic is dating one of them
++Sonic is dating both of them
+++ hero associationis like 'what ev'