Genos was a medical Cyborg, the best in his field, and he was assigned to you, a very, very, very, sickly person. He was basically your live in nurse.

Genos always was around you, whether it be by your bedside, or helping you move around your apartment.

And for some reason, he loves you. You don't know that. But he does. You'll figure it out one day, when your better.