on the yqy gets truth serumed thing: we find out because during a peak lord meeting, lqg says smth smth sqq sux and i hate him, and usually what gets said is "shidi is permitted to his own opinion, of course, but blablabla-" what comes out the sect leaders mouth THIS time, however, is "oh fuck your mother you foul tempered brat; jiu can do as he pleases and so help me if he threatens to leave because of this i will use your skin as a rug ^^" no one was ready.
YES
Exactly this is the vibe I picture if Yue Qingyuan got dosed with a truth serum.
Someone says something about how Shen Qingqiu's whoring is dragging the sect's reputation down, but what could they really expect from a man like that. Complete with a meaningful glance. And of course it's expected that Yue Qingyuan will take his side, even if he tries to word it diplomatically, they all know how he is...
And then Yue Qingyuan says "I'm going to break your jaw and rip out your lying tongue for slandering Shen Jiu. We don't even have anything in the rules forbidding sex you stupid piece of-" at which point Liu Qingge and Mu Qingfang both tackle him because something is clearly wrong with him and they can't rule out possession right away.
Everybody is mortified when Mu Qingfang confirms it's a truth pollen, but Shen Qingqiu just sits there completely floored because Yue Qingyuan would commit violence for him? Despite everything?? Then why hasn't he done any of that?! At least put in a little more effort when standing up for him to discourage the rich idiots from picking on him! Useless shixiong.
They wrap Yue Qingyuan in immortal binding cables because they don't trust his word that he always thinks like this and the risk of him acting on it is not one the can take, and he kneels in front of Shen Qingqiu and tells him that he would do anything to have his trust, his love back. If Shen Jiu asks him to rip out his useless, treacherous tongue, to crack open his chest and hand him his still beating heart as proof of his love, he would do so even if it's the last thing he would do in this life.
And Shen Qingqiu swoons because okay, there's something fishy here, but that's the kind of devotion he wants (devotion to match his own) and he is still fucking mad, don't get him wrong, but keep talking he's listening.