He doesn't say, just waits for her to get closer to him - which she might have to, if she wants to keep walking along the bridge with her friends. 

Nnnnn she doesn't want to, but she can't stop...

"Your body will do quite nicely... I'll take it," the youkai says when she's closest, and lunges at her.

Punching thin air is better than being taken over so she will try to punch the youkai in the face.

That seems him flying back head over heels, though he recovers before he splashes into the river below. 

And her friends turn at the sudden motion. "Natsume - ?" her other friend Nishimura asks, clearly uncertain. 

"There was a mosquito," she says.

He laughs. "Scared of bugs?"

"I prefer not to be bitten."

Nishimura teases her a bit more as they all walk, but drops it soon enough under Kitamoto's encouragement.

And the youkai doesn't loop back to attack her again that walk. 

That's good. She'll have to be on guard, though.

Nothing molests her the rest of the day. 

Maybe Nyanko-sensei will know what was up with that. She'll ask.

"Did it seem like two separate youkai, or just one?"

"Not sure. Just one, I think."

Hum. "Human-shaped youkai are rare, and sometimes powerful... Though I can't imagine why he'd want to take over your body. Did he look ill?"

"Roughed up, maybe."

"Still shouldn't be enough..." She'll ask for more details about the short not-conversation and his appearance, then. 

Tsubaki will share everything she remembers.

"It'd be strange if he wanted your body for himself."

"So there's probably another one he's with."

"Yes. And he might not give up just like that."

"Nothing's ever that easy."

"Already realized that? Good."