You’re a cyborg that was made to completely counter Genos, you were created to look like a bit of a darker version of Genos (so basically a more Edgy Genos), you killed your creator when you were finally strong enough to seemingly beat him, and went off to find Genos and fulfill your purpose, which you had….never..never questioned. Tatsumaki had commented about how Fubuki’s chest was a little too big, and inadvertently knocked over a vase onto the carpet with her thigh. Then an argument broke out as two who has bigger what, and for some strange reason, they decided to dial for you and Genos to come over to their home. Genos was measuring Tatsumaki’d thighs, while you had to measure Fubuki’s chest, and both of you couldn’t help but wonder what in their right minds would make them argue about their bust

“Well, sister. It seems that this will prove that your chest is far too-“ Tatsumaki puts her hands on her hips, not ready to admit whether her legs are bigger than Fubuki’s chest

“Her chest and your legs are the same size.” Genos casually looks up at Tatsumaki, still wondering why Tatsumaki and Fubuki would have an argument about their bust of all things