It's the last thing he expected, and it has him gulping in a breath as he tries to wrangle words into- something from where he'd been, which was closer to the edge than it wasn't. He almost rocks into the fingers around him before he parses the question.

"I- I don't know. I just-"

He wants to come. He doesn't- options are mostly just a little overwhelming for the moment. But M clearly wanted an answer, so he scrambles his brain enough to try and get one.

"In your mouth?"

That seems... reasonable? It will make less mess, maybe. Hopefully it'll taste all right? He's read somewhere that vegetarians taste sweeter or something, so there's that. But he's not sure if that's just hearsay or- he's going to have to suck someone else off to test this or something, not that it helps him right now. He wonders what M tastes like.