[ Though Mizuki doesn't have a voice, that doesn't mean noises are totally off the board for him. That is to say, the moment Othergato pushes his fingers into the sensitive nerves on his back is when Mizuki lets out a gasp. Not from pain, just surprised... and judging by the way his whole face heats up, it's likely any noise he'd make with his voice if he had it would've been debauched. His tendrils squeeze Othergato - not enough to hurt, just enough to get his attention. ]
S...ns...t...v... [ 'Sensitive'. He's not going to get too mad at him, he probably didn't know? But also, he'd pretty much only let his partners touch there - so Affogato, not Othergato! - and only when they were ready. He squirms, not wanting to totally bail on them, but he was already overwhelmed and flustered!!! Now it's just x2! ]
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S...ns...t...v... [ 'Sensitive'. He's not going to get too mad at him, he probably didn't know? But also, he'd pretty much only let his partners touch there - so Affogato, not Othergato! - and only when they were ready. He squirms, not wanting to totally bail on them, but he was already overwhelmed and flustered!!! Now it's just x2! ]