[Stepsiblings, while certainly still familial, does feel like a fantasy in the moment. He gets why — they resemble each other pretty close physically, don't they? And that isn't even the only commonality they share. So he understands it, and he's fine to play along in the moment, no matter the fact he would never behave like this around his true siblings.]

You were going to abandon me? How cold.

[It's cute how Ishmael plays right into the dialogue of their relationship, setting it up with the context of a real scene. It makes it easier to feed off of her energy, to enjoy the playfulness of it.]

Oh, nothing, it was canceled. I hurried to make sure that I could catch you in time, because I didn't want you leaving on your own. [Cheery, clingy little brother he is, then. As the crowd deepens, he doesn't hesitate to shuffle closer to her — effectively pushing Ishmael up against the glass, with his taller frame blocking her in.] You know how guys try to mess with you.

[Then he leans, just enough to whisper near her ear, with a smile that dares to look innocent —] Are we calling each other stage names, or our real names?