[Johnny was relieved he wasn't going to have to force Guy, it was easier if it was all voluntary.]

There are two points on the body that are easiest to drink from: the junction where your shoulder meets your neck, and the arm. The thigh isn't so bad either, but you'd have to take me out to dinner first before we got that intimate.

[He smiled, hoping the joke would cause Guy to smile, at least a little. He knew this wasn't the most pleasant thing.]

So, just choose one and go with it. The neck is a little more comfortable for the one being bitten as all they have to do is stand there, but even that can be a bit too intimate for some, so the arm is fine too.