[even though Tonic has guessed correctly, Tek still has that little smile on his face, so it may be because he simply likes his own eyes.

at first, he acknowledges Tonic's win by sitting up to begin unbuckling one of his own boots without comment. but, after a moment, he feels he should maybe offer a freebie and give some explanation. nothing in the rules against that, right?]

It's a family trait. Though, I've learned it's easier to just let others assume that it's some kind of fancy cosmetic procedure.