Well there's no reason not to escalate then.

The hand rests on her thigh, as he remembers he doesn't actually know what he's doing.

She moans more loudly; her back arches; "please," she whispers, "please, please," and then she shudders in what is recognizably an orgasm.

He has very little clue what exactly he did there, but there's still a warm glow of being the one who gave Evie that.

"That's impressive."

Her orgasm does not at all seem to have made her less eager. In fact, she's trying ineffectually to grind against his arm.

He laughs, but it sounds mostly awed. "So greedy."

This seems like it would be easier with his hand, instead.

Evie gasps and rocks up against his hand.

His fingers seem to know, almost intuitively, where they're supposed to go.

Oh, that's much easier than he expected it to be. He expected to have no clue, but his fingers just go where they're meant to and Evie seems to be enjoying it so much.

The underwear is a barely-there, wispy thing. It would be very easy to take it off. Evie might not even notice.

Okay, let's be realistic, she will totally notice, she's just probably not going to stop him.

She lifts up her hips to help him, in fact. 

It's very nice of her! And presumably not having fabric in the way makes things feel better.

How much familiarity does Jing Yi happen to have with vulvas?

He Is Broadly Aware Of Their Existence.

This is the first time he has encountered one in person, as such.

Her cunt is warm and wet and even before he puts his fingers in her vagina her labia surround his finger on all sides. It reminds him of nothing so much as some kind of odd animal, a mollusk perhaps, one of those species that hasn't evolved for thousands of years. But unlike touching a mollusk, which is slimy and gross, stroking down Evie's cunt-- from her hard little clitoris to the entrance of her vulva-- sends a wave of pleasure through him unlike anything he's ever experienced, a kind of rightness he's never felt when touching a dick. 

It's kind of startling. Not that he's never enjoyed giving someone else pleasure, of course. But there was never that sense of rightness, the sense of being made for this. Millions of years of evolution and an unbroken chain of people doing this, and him continuing that legacy.

Is this how straight people feel all the time?

The intuitive sense of what Jing Yi should be doing thinks that he should be concentrating attention on Evie's clit right now. Little circles around it, at a steady pace. 

Well, his intuitive sense hasn't steered him wrong thus far!

It doesn't feel quite like he expected it to, but he's not quite sure what he actually expected it to feel like. But it feels good. Fleshy. ...in the way where 'fleshy' feels like a far too crude word for something that is actually nice.

She whimpers and bites her lip and throws her head back. 

Her hand finds Jing Yi's dick and starts to play with it through his pants.

That's as good a reason as any to try and get these pants off in as graceful and elegant manner as possible.

...

"These are worse than shirts," he says, while in a one handed fight with this own belt buckle.

"The best packages come in wrapping."

He laughs. "That's half the fun of Christmas." And he finally manages to undo his belt.

And now she can stroke his dick much more easily.

She certainly can! Though this is not improving his coordination at either touching her or getting the pants completely off.

Aw, maybe she should wait for his pants to be off.

It's very unfair they live in a world where there is not limitless coordination.

But now the pants are off.