Answer:
nascent friendship
Explanation:
Nascent friendship is in the fourth stage of friendship, in which people start to think of themselves as friends and work out their own patterns for interaction. In this case, Ali and Saachi have gone through the previous stages of friendship, like role-limited interaction in Math class, friendly relations to check they share a common ground, and moving toward friendship, in which they have shared personal information. Finally, they are beginning to consider themselves friends.
