Read ur wolf red headcannons. So it’s implied that he may get jealous if he smells new scents on sans? Like if sans was hanging with uf grillby( not ut grillby) he’d get extra jealous? I headcannon that if grillby is really flirty,sleazy but secretly a good guy deep deep deep down. I can imagine sans visiting uf grillbys being flirted with and red ( from any of your bara au’s not just wolf red) wasn’t too happy about that.
Oh my~ noonie! You got wolf Red’s number down XD
I’d say that Chillby (UF!Grillby) would most definitely try and flirt with Sans any chance he can... just to get Red angry X’D
I just like the idea of Red and Chillby being frienemies. Mostly for the same reason why I think Red and Edge would fight all the time, for the show. You can’t show someone is close to you in Underfell cause it would put you both at risk, so you fight to show “you don’t really care about that person”. So Red and Chillby fight, even though they would never harm each other... badly.
But flirt with a bonefriend? Hell yeah XD
Since Chillby would know that Red can smell him on Sans, he’d go out of his way to touch Sans as much as he could, purposefully leaving a trace of his magic on Sans. And Sansy wouldn’t really mind. I mean, his universe is a lot more chill with touching and he wouldn’t find it super weird if a friend put an arm on his shoulder when joking, or pet his head in a “you’re hilarious” way, or “help” him clean up cause he “accidentally” spilt something on his hoodie... you know, friend things >;3
But here’s the thing. In Underfell, touching a claimed mate is... bad. It could be used as a threat and it messes Red’s instincts to protect up. He tries hard to keep himself civil for Sans, cause he trusts his little mate. But he doesn’t trust Underfell monsters, not one bit. Yet he does trust Chillby, he knows the bartender is just messing with him, but it still raises his hackles when he catches the scent. And if Chillby isn’t careful, it might end up in a bad fight >.>
The other bara Red’s would react pretty much the same, yeah. Except, bara Red wouldn't really be that sensitive to scent marking, but if he saw Chillby touching and flirting with Sans, he’d go full jealous mode XP
Though trust me noonie, if Red ever really went full crazy jealous, he’d have a tiny judge to beat his ass back into place.