Mari does seem a more than a bit pleased with Dia's reaction, with the way she's caught staring and just a bit flabbergasted all over again. She's still a bit embarrassed at that momentary hiccup, but it looks like she's managed to gain leverage back, and she's fully expecting Dia to go on another little rant of hers, just to maintain the status quo. She likes to think she has a general idea of how to push Dia's buttons, after all, so there shouldn't be much of an issue here.

But Dia completely betrays her expectations, for better or for worse. She doesn't quite know why she didn't expect it; what, did she just expect her bare chest to be hanging out untouched for the rest of the night? But still, she didn't expect Dia to simply take hold of them, and she didn't expect her to do it so immediately, with such gusto! That's not fair, she can't just do that--

"D-Dia!"

This time, she doesn't recover so quickly. She closes her eyes and tries to stifle a gasp. Dia's just stuck her hands right on them, she's not even doing anything, but she's never ever done this before, not even when Mari was fully clothed, and that thought is enough to make her start to sweat, on top of how red in the face she's becoming. She's never seen Dia swallow her pride and be this forward, so if she's completely betraying her expectations like this now, there's no telling what'll come later. This is completely uncharted territory, for both of them.

Now her heart is the one that's starting to pound out of her chest. She can't even use suddenness as an excuse this time, since Dia practically announced it, but she's still so surprised that she can't help but squeeze Dia's breasts in turn, her eyes clenched shut as her breath hastens.