It wouldn't occur to him to be anything but happy and pleased to take what instruction Ned's giving him, and he likes hearing Ned's voice, too, the way it catches a little. That reassures him that he's doing something right, that he's able to make Ned feel good, and that feeling is almost as arousing as the purely physical sensations from what they're doing. So when Ned tells him he can mix it up a little, he's quick to take the advice, interested to see what switching up his pace will do, what new and exciting noises Ned will make.

At the same time, and rather belatedly, perhaps, he remembers that he has a free hand, too, and remembers the way Ned had touched him when the roles were reversed. Ned hasn't instructed him to do it, but somehow, he doesn't think he'll oppose a little improvisation, so he reaches between their bodies, stroking Ned slowly at first, and then a little quicker to match the rhythms of his movements.

The way Ned runs his fingernails down his back makes him shiver, and press a little closer to Ned, if such a thing were even possible. There's no containing his own moans and whimpers, not at all, and he's glad and amazed that Ned can make him so good and he can do the same in return.