Well... [He can't stop showing-off, sorry. Especially when it comes to magic.]
I can make someone feel cold, or hot, or... [there's a flicker of gold in his eyes and Porthos should feel as though a hand is stroking over his arm, lightly.] That. And that can feel as light or as strong as I'd want it to be. [To go from tickling someone to choking them...]
There's also, uhm. [He blushes for this one and holds up a hand, using his magic so it's covered in oil. And then again so it cleans up spotlessly.]