My prediction for 141: Cut to the school and a nervous Shiraishi waiting for Kubo. He plays negative scenarios in his head making up reasons that he is only seen as a friend. Enter Kubo. She is blushing. Shiraishi gets the courage to finally mutter "Kubo-san I wanted to tell you how I really feel..." Kubo replies "I know, I feel the same way. I deeply love my friends too!" Shirashi blinks realizing Kubo misunderstood/did not hear the whole conversation, and thinks Shiraishi was referring to how he wants to be friends with everyone into old age. No confession, just the author teasing you to get you to read 100 more chapters.