What if you made a plushie version of the avian boys and gifted it to them as a courting gift after you figured out they were trying to court you? (ft, Sans, Red, Axe, Dust, Killer, Nightmare & Error)
Sans would be super flustered, and super appreciative. He'd keep the plushie in his nest all cozy-like and show you it excitedly whenever you turn up to visit him.
Red secretly loves it. He eyes it with faint amusement and he's really happy that you want to court him as well, but he's not going to be like Sans when it comes to it. You don't think he likes it until you end up in his nest one day and your plushie is sitting there in prime condition.
Axe loves the plush- and loves to get you to smother it in your scent so he can snuggle with it at night. Sometimes he hands it back for a day so that you can snuggle with it while he has his scent on it.
Dust probably stares at his look alike before simply nodding. He definitely likes it, though. Keeps it in his nest in the corner that's the least likely to get wet.
Killer actively shows you how much he loves it, keeping it with him almost always. He likes to pull it out and show you it with a happy grin. It's not necessarily in a very good condition, but it's definitely well-loved.
Nightmare gives you a forehead smooch as thanks. He loves it, and he'll often start staring at it silently with a happy expression on his face. It's common for him to snuggle up with it or sit it in his fluff.
Error absolutely adores it and will make you one in return. 'Cause then at night it's kind of like cuddling each other from afar and he really likes that thought. You'll see him happily grinning whenever he plays around with his plush.
Hehe, plushies. Gotta love 'em