See, the thing is, Ludwig doesn't mind it when it, ah, happens, since Feliciano managed to get across to him that he didn't mean it hurt, quite the opposite in fact. What he minds are the faces Gilbert makes at them in the morning.

There is the Eyebrow Wiggle, which wasn't really ever funny to begin with, and the Stare Conspicuously At Feliciano's Butt, which Ludwig is seriously going to talk to Gilbert about, and the Silent So-You-Two-Had-A-Good-Time, and the You Distracted Me From My Video Games, and the This Is Bullying I Never Get To Do That, and generally Gilbert has a lot of faces.

He honestly wonders what face he'll get in the morning for this.

Feliciano winks at him from his seat next to Ludwig on the bed, makes an astonishingly realistic and loud moaning noise, and hits the wall behind the bed with one of his fists before bursting into hastily muffled giggles. Recognizing his cue, Ludwig hits the wall a few more times for good measure (there's a noise from the hotel room next door that sounds like Antonio falling off the bed) and bounces in place, silently thanking God for cheap hotel bedsprings.

Feliciano bites down on the sleeve of his overlarge button-down (someday Ludwig will have to talk with him about clothing theft, especially after that near miss at Alfred's birthday party) to stifle the next round of giggles.

This will hopefully go better than the last time they tried messing with Gilbert and his friends like this, since that time, due to a combination of a low ceiling, a high bed, and a lot of effort needed to get any noise out of the springs, had ended in Ludwig getting a pretty nasty headache.

Judging from the low and unmistakably French whistle from the adjoining room at the next noise out of Feliciano's mouth (how are they actually falling for this, he's loud but not that loud), it's going better than last time.

Ludwig punches the wall a little harder, just to make sure.