[The swat gets a huff of surprise out of him before he just gives a chuckle. Maybe he likes that serious look, the chiding when it's from Koby. Just a tiny little bit.] Okay! Promise, promise. No marks.

[But that doesn't mean anything about marks lower, right? Something for Koby to look at later-- except someone might see him change still? And he doesn't want to cause him any actual problems.

When Koby rises up to take his own clothes off, Luffy takes the chance to push off his own shorts, kicking them off, even as heat starts to creep up to his cheeks, a flush of arousal going through him when he looks at Koby out of the corner of his eye. He's hard, and it's even more obvious when he's straining against the thin fabric of his underwear.

And if that wasn't obvious, Koby sitting back in his lap like that is enough to draw out something like a surprised squeak all of his own, eyes going weight at the little bit of friction. He looks between their bodies briefly, at the obvious slick spot, and looks back up. This is a lot more real, isn't it? And Luffy is equal parts enthusiastic and maybe a little bit lost. He knows the basics. He knows point A to point B, but not all the finer details.]

Koby-- [He licks his lips and brings his arms back around him, pulling him in closer, nuzzling back into his neck.]

... I didn't think it was possible to want something as bad as I want the one piece, but-- [This is definitely creeping up close second.]