The kisses Joseph gives his brothers are not only affection. In Targum Pseudo-Jonathan's reading, they are grief in advance.
"And he kissed all his brethren, and wept over them, because he saw that the sons of his people would be brought into bondage. And afterward his brethren discoursed with him" (Genesis 45:15). The Aramaic preserves the strange timing of Joseph's sorrow. He is reunited. He is holding his brothers. And he is already weeping for the enslavement that will befall their descendants centuries later in this same land.
Joseph sees it. The Targum insists he is a prophet in this moment. The shibbud Mitzrayim, the Egyptian bondage foretold to Abraham at the Covenant Between the Pieces (Genesis 15:13) — four hundred years of slavery for his descendants — will unfold in the very Mizraim where Joseph now governs. His hospitality is the first step of a road that leads to Pharaoh's whips.
The sages find this devastating. Joseph is saving his family from famine, yes. But he also knows — the Targum says he sees — that the rescue is the beginning of a long captivity. The grain today will become the bricks tomorrow. The welcome at Pharaoh's court will become the hard labor under Pharaoh's overseers.
And yet he kisses them anyway. He weeps, and he kisses, and he brings them down. Because the Holy One's plan requires the family to enter Egypt. The four hundred years must pass. The Exodus cannot happen without a slavery to exit. Joseph cannot stop the future, but he can at least meet it with open arms and full granaries.
"And afterward his brethren discoursed with him." Only after the tears could they speak.