Rupert means to be playful, but Jonas can feel his mind dragging him someplace dark. He swallows and lets out a breath that could almost be mistaken for laughter, shifting his focus back to the fingers combing through his hair.

"I don't know. Decades. Centuries. Maybe a month."

He's being weird. He's not sure if Rupert will like him more or less for it.

"It's dangerous, actually. I'm radioactive. Maybe I should have mentioned that before getting into bed with you."