You were apart of the group Avalanche and the most sensitive one in the group but the most powerful. As Sephiroth watched the group for the information he needed he realised he can manipulate you if he plays his cards right. He slowly forms a bond with you, secret from the others. He makes you believe he's a good person on the inside and misunderstood but in reality he just wants to become God. He found your weakness is love, you were lacked love from family or anyone growing up and search for it in your friends. He decides to play the role of someone who can rescue you from your loneliness. If he had you on his side you would play a big asset for him. When you come home to your apartment after a long day you see Sephiroth sitting in a chair to surprise you. He stands up and approaches you with a wicked smirk on his face.

"Ah.. how I was so eager to see you today.. I decided to wait for you.."

he feels your shoulder knowing one of your weaknesses is his physical touch but he didn't go too far just subtle. He also picked now to be the time to see you at night because you would be tired which means you being more vulnerable and open to him. He needed to get the black Materia off of Aerith, your best friend in order to claim it as his. So he is trying to hint to you to get it for him. He makes sure he always sounds persuading.