Stands to reason.

"- I might not actually want to be around when you do tests with rewinding even if I'm here for time stopping tests."

"Yeah I guess that'd make sense. Would you wanna be somewhere else here or just leave altogether so there's zero chance I'll do something you'll be affected by?"

"Somewhere else here might be good enough? Like, if you have some kind of horrible emergency you can telepathy me wherever I am anyway."

"Yeah, alright."

"Thanks."

He's gonna make sure all windows are shut and lights are on so that the time of day won't affect the tests, transform, and turn the gem on the back of his glove into a bauble again to leave it in front of the camera so that there won't be issues with different camera angles and whatnot.

And then, to testing!

Meaning, stopping time and making out?

Well, first stopping time alone a few times to check whether doing it as his gem gets darker makes it darken the gem more or less, relatively, but then yes!

Haru will be so helpful with this experiment.

It definitely more than makes up for the alone times in which he had to sit on his ass doing nothing the first few tests.

Well, during those times he could gaze at Haru's statuesque (in the sense of being as still as a statue) visage, but yeah. Kisses!!

And still no neck kisses?

...maybe a little? Just not enough to make Haru forget himself entirely.

But it would be so fun if Haru forgot himself...

Well, that's fine, Yutaka isn't in a hurry, at least not yet. He will go when Haru says go and stop when Haru says stop.

He can get Haru quite shivery and giggly and extract some quality moaning noises before Haru stops him.

Yutaka hopes Haru doesn't mind the very obvious physiological reactions he's having to all of this that he is not particularly trying to hide while pressing his whole body against Haru's.

Oh, no, not at all, that's to be expected and he's not the only one.

Then the experimental results are: the decrease in illuminance from stopping time seems to be really tiny, so much so that it's not entirely obvious if it's a linear or nonlinear cost in terms of how bright his gem currently is. That said, it seems like spending twice as long in stopped time is about twice as costly, and having Haru with him doubles that, too. But this suggests that Yutaka has quite a lot of slack with his time stopping.

"That's really good if you don't have to be thrifty about it."

"Does that mean I get to splurge by taking breaks during my day to make out with you or are we being more responsible than that?"

"What, you'd pop into the bathroom, emerge and kiss me right in the middle of history class, and then dip back out again? - I don't know if you should actually do that but now I'm going to be thinking about it."

"Ooh, should I surprise you? This class is so boring, isn't it, but at any moment it could become a lot less boring..."

"It might be more boring for you than it is for me because of how you did this month already. - maybe you can do this after we save Tokyo, we don't know how close we're going to be cutting it on spare magic."

"That's true, I suppose I ought to be thrifty until then... at least a bit."

"Yeah. Like, clearly you shouldn't stress about it but that doesn't mean you should be profligate."