Sion's response to Akiha was a soft moan, followed by a little shivering. That shivered was partially from fear, because she had no clue what was going to happen. But it really turned her on.

Enough so that Akiha would find no resistance when she put in the toy since Sion was extremely wet. Feeling it go all the way up to the hilt caused Sion to cry out Akiha's name loudly in lust, overcome by her words and actions.