The balm, his [singing], soaked in through my roots and flowed to the tips of my branches. -- indirect object?

Wrong.

Direct object?

4. My longing makes my heart ache.

3. My body perspires heavily instead of trembling.

The gerund, "singing," is an appositive.

To identify the indirect object in the sentence "The balm, his [singing], soaked in through my roots and flowed to the tips of my branches," we need to understand the components of the sentence.

1. Subject: "The balm, his [singing]" (referring to the singing)
2. Verb: "soaked in" and "flowed"
3. Direct Object: None present in this sentence.
4. Indirect Object: Unidentified at the moment.

The indirect object is a noun or pronoun that receives the action indirectly, typically indicating to whom or for whom the action is performed. In this sentence, we don't have a specific direct object that would correspond to the indirect object. Therefore, it seems there is no indirect object in this particular sentence.