Established bingliushen where literally no one else knows that they're already together even though they're not even hiding it
Binghe swings by during a peak lord meeting, and Liu Qingge chases him out. The peak lords think it's because Binghe is technically still banned: Shen Qingqiu knows it's because Liu Qingge is still mad that Binghe woke him up by biting his ass that morning
Liu Qingge, on his way home from a mission, notices a stall with pretty fans and starts examining them. The other cultivators on the mission share pitying glances, because "poor Peak Lord Liu; pining over a man who's smitten with another!" But actually Liu Qingge is staring at this One Fan because he's 95% certain it's one of Shen Qingqiu's custom-made ones, and now he's debating whether to check if Shen Qingqiu is at a nearby inn to confirm or just skip to fighting the stall owner for stealing his boyfriend's fan
Binghe calls Liu Qingge "husband". Everyone thinks he's being sarcastic, especially when Liu Qingge rolls his eyes. (He is rolling them because they're not married yet. "Yet," Binghe will repeat.)
Shen Qingqiu tries to convince Liu Qingge to "give Binghe a chance". Others think he's trying to get Liu Qingge and Binghe to become friends, oblivious to Liu Qingge's true feelings. In reality, Shen Qingqiu is trying desperately to get Liu Qingge to forgive Binghe for the second ass-biting incident and to let Binghe back into their bedroom (as Binghe has been exiled to separate quarters until further notice).
Bingliu starts dueling in public and everyone shakes their head and sighs, like "poor Shen Qingqiu. Will those two ever get along?" Not knowing this is considered foreplay in bingliu language. Shen Qingqiu is perfectly happy to let them tire each other out.
Liushen going through town on their day off, looking at matching couple's accessories together and buying a set. Sightings spark terrible rumors of a possible affair. Meanwhile, liushen was just looking for a reasonable gift for Binghe, who loves finding ways to match outfits/accessories with his husbands all the time.
Binghe whining and complaining to Shen Qingqiu about how "unbearable" Liu Qingge is. He is upset that Liu Qingge still won't forgive him for the ass-biting. It's not his fault Liu Qingge's ass is so shapely!
Liu Qingge embodying indoor/outdoor cat energy by basically wandering in and out of all of Bingqiu's properties as he pleases. He shows up for six hours one day and then a month in another visit, with a three month gap between the two. The entire time he's either at Cang Qiong or thrashing monsters in some random forest. The first time, he shows up to the demon palace unannounced while Binghe is holding court. Liu Qingge kicks the door down while some noble is airing their grievances and loudly declares Binghe's security detail is dogshit. He is covered in blood. He does not seem bothered by the meeting around him as he drags the carcass of some rare beast Shen Qingqiu asked for to the foot of the thrones. Unsurprisingly, the demon realm catches on much quicker to the situation.
