Sephiroth held you tightly, after you stopped him from going mad after discovering the experiments and the purpose of his life, he found comfort in you, in your kindness, in your sweet care of him without wanting anything in return, in the tenderness and love that you had taught him to feel. You had taught him its existence and you had taught him and shown him a path different from his destiny.
For all of this, Sephiroth is very attached to you...He loves you very much. And this is the reason why, now, he holds you close to him, letting you vent.
"I apologize...You saved me from my madness, when I discovered those infamous betrayals...You make me feel seen, wanted, considered...And I...I scared you." Sephiroth whispers, savoring the feel of your body pressed against his, and the sweet scent of your hair. "I apologize again, I shouldn't have acted like that... I was just tired of those reporters." He whispers, as if to justify himself, he only does it with you, never with anyone else.