[Akihiko gives a low agreeing murmur; maybe they're a little out of their depth about this; it's certainly nothing he's ever trained or studied for. But for all of that, they don't seem to be doing too badly right now. Especially if the contentment curling through his chest and relaxing his muscles is anything to go by. He could stay like this for a while-

...But he's about ready to groan when Mitsuru brings up 'your girl' again.]

"...Phrasing it as 'my girl' was a mistake. I'm starting to realize that."

[As he talks, he lets his head drop a little closer so he's closer to her ear. And that enticing spot on her neck.]

"Would you prefer 'girlfriend' then? Or is 'partner' more of your thing?"

[And as he's saying all that, he lets his lips just graze at her skin. Two can play at that teasing game, although he's a lot more physical about it.]