She didn't mind if he arched upwards, it actually let her get more of her tongue into his ass the more he gave her room. Sometimes she bit down on his thighs very gently, and ran her tongue along his balls, before going back down to his ass, pushing her tongue in until she had pushed past the ring of muscle and was fucking him with her tongue.
Watching as Kirk climbed up on top of Tony, she slid her hands down where her tongue was, letting her finger toy with him along with her tongue.