Feeling the motion of Barcus's head is almost pushes him over the edge; just a little more and he climaxes with a series of gasps and wordless exclamations. He's aware of Barcus's hands, and in a moment, as he comes down, he'll pull himself together enough that he can reciprocate. He wants Barcus to feel this.

"Amazing. Wonderful." Bel wants to look at Barcus, make sure the gnome knows he is appreciated and desired and all those things. The rush itself has faded into a warm glow, meaning the smile Bel was giving Barcus was affectionate without conscious thought about how he appeared.