I think it would be funny if Shang Qinghua and Shen Qingqiu decided to get married, not for tax purposes per se, but for marriage/sex curse immunity. secretly, of course ;)
why would they do this, you may ask? why wouldn't they? excluding aphrodisiacs, there are plenty of curses and/or magical objects just laying around the SVSSS world just waiting for an unsuspecting Peak Lord to trip over them. And since Shen Qingqiu has decided to travel to see all the worldbuilding and cool flora/fauna he missed out on in the original PIDW, he's dragging Shang Qinghua along with him for the ride. Of course, they would need protection against the more serious afflictions they could catch or be caught by, and getting married was the perfectly logical solution!
and if they ended up getting sex-pollened and needed to rail each other anyway? if they both said no-homo after, then it didn't count! and if they had started to sleep in the same bed and woke up in each other's arms, that's because it's cheaper than getting separate rooms! Who cared that Shang Qinghua started to sleep over at Shen Qingqiu's peak when they were both back at the sect? And brought him gifts and food? And that he reciprocated? They were obviously just hanging out as friends.
And friends are supposed to be affectionate and show care towards each other! They're the only transmigrators in this world, so they need to stick together! Watching the other jerk off can be a bonding activity, you know!
And if Shen Qingqiu noticed one day that they stopped saying no-homo? They already know they aren't gay, so it would be redundant to keep saying it. Carding your fingers through your fake (real) husband's hair while he lays in your lap and complains about the merchant's trying to weasel out of a deal with the sect is completely straight behavior!
