[Between the remark and the question, Boothill can't exactly help the flush and he laughs, once again a little self-consciously.]

Ain't nothin' you did wrong - simply got lost in my head for a bit, there. I haven't been this close to anyone in... awhile.

[So maybe he was worried about enjoying it too much instead of seeming distant and possibly insulting. Really, thinking about this too much is just going to do his head in, and he'd rather not think about how long it's been since anyone last touched him like this, when those memories are so intrinsically tied to his desire for revenge, which he can't even pursue here.]

Didn't mean to offend, and if you're lookin' for more, then maybe I'd be down to indulge ya.

[It's a little awkward, like he hasn't properly flirted in a long time, but he's trying to bring his confidence back because hell, this place encourages it, and Boothill's not one to be so uncertain for long.]