Well, here's something obvious, you only get to do anal with your wife once in this game. It would also also be nice to expand on the content with that noblewoman and her assistant. Say they come back with an offer for the protag and his wife to go into their service, the protag as a blacksmith and the wife as a whore.
Other stuff, variable outfits for the wife, both with her clients and with the protag. There should be lingerie/bodice versions of all the sex scenes in the game so far IMO. You could also have the wife work as an erotic dancer as well as a whore, Furthermore, along the lines of variable outfits, she could have nipple rings and clit rings linked by a chain, with a placard also linked to those piercings with the word whore written on it, maybe. This might be a bit much, but it would be a nice example of corruption. You could also have her get womb tattoo, body writing, stuff like that.
Furthermore, lesbian content, this kinda ties into the noblewoman and her maid stuff, they could have the wife service them while the protagonist does, or he could watch, maybe have a choice there? The wife could also have lesbian clients at the brothel.
That scene with the orc could stand to be expanded upon too, maybe somehow the protagonist finds the wife being fucked by the orc? Either at the brothel or at whatever camp or similar such place the orc lives in. The husband could watch, or he could join in. Hell, the wife could wind up servicing a whole tribe of orcs for money.
On a more vanilla note, you could also have more romantic scenes, (including sexual scenes, obviously) with the wife and the protagonist. You can guess what I mean here, really. Kissing, hand-holding, tender moments and consensual loving sex.
That's all I can think of right now. Bye for now, dude.