Miko sounded excited because she was, as a person just generally excitable. The fact that he planned to spray her in his bodily fluids wasn't even something she disliked in the first place, and since she could prepare for it, she would... or so she thought. Though it seemed as if Hiruko would be pulling himself back he instead pushed further inside her body. The hiccup that left her lips at that push forward, was melodic but abrupt. "HYUUUCK♫!~" And then it continued. Those deep thrusts would do nothing but send the girl careening over the edge of bliss once more, with the happiness of someone actually entering her womb which she'd wanted the previous day. So deep was Hiruko that the girl felt fulfilled if only for the moment.
And when that happened her eyes gently crossed. With more than a splash of champagne flavored jizz to coat both her mouth and body the extra sensation her body was experiencing would take her a moment to get over. She was seeing stars in doubles. She swallowed initially but her tongue came back out reflexively to lap up fluids while she tried to blink away the sensation. What she couldn't blink away though was the extra stimulating sensations. It was like her body was tingling all over and was moaning happily, actually, she knew a feeling like this before. Even with that recently completed orgasm her loins wouldn't stop tightening as if she wanted to be filled again. "Hiru-nii♪! You might be a bit too good♪~" she sang happily.