[There probably aren't too many humans who would objectively find this situation as erotic as Robert finds it right now; his stomach is full of the hypothetical butterflies and he's all-too-aware of his own arousal pressing up against himself. But he doesn't pay any attention to it; instead he takes in Don's own masturbatory techniques and emulates them himself with his small, slender fingers - probably so different from Don's own, at least in such a sensitive place. ... Well, comparitively sensitive, anyway - turtles aren't exactly as sensitive as humans are.
He licks his lips occasionally, both from concentration and from the very human urge to get his mouth involved, but he doesn't yet - after all, Don hasn't given him permission to do anything like that.]
I... I-I would love to... b-but wh-what... what a-are you comfortable with...?
[He still can't forget Don practically having to suppress panic at having his plastron stroked, and it makes logical sense that somewhere like his genital region would provoke even more panicking.]
[Action]
He licks his lips occasionally, both from concentration and from the very human urge to get his mouth involved, but he doesn't yet - after all, Don hasn't given him permission to do anything like that.]
I... I-I would love to... b-but wh-what... what a-are you comfortable with...?
[He still can't forget Don practically having to suppress panic at having his plastron stroked, and it makes logical sense that somewhere like his genital region would provoke even more panicking.]