I think as long as you don't bite you should be okay.
[It's the first certain thing he's said so far. And probably the last because while he can keep himself from bucking against her mouth at the investigatory lick, and even at the second more confident one, her stroking makes his cock twitch, and Kazuya makes a noise very near to a whimper as she strokes him with her hand and sucks on the tip of his cock.
The one of the hands balled at his side immediately comes up to his mouth, and he bites down hard on it to try and keep himself in line, and he inhales sharply through his nose.]
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[It's the first certain thing he's said so far. And probably the last because while he can keep himself from bucking against her mouth at the investigatory lick, and even at the second more confident one, her stroking makes his cock twitch, and Kazuya makes a noise very near to a whimper as she strokes him with her hand and sucks on the tip of his cock.
The one of the hands balled at his side immediately comes up to his mouth, and he bites down hard on it to try and keep himself in line, and he inhales sharply through his nose.]