I was subbed to their SubStar for a month. Here to clarify some things that I've read from the comments.
I will be referring to TWAQ with they/them as I have only read conflicting info about their gender. AFAIK they only stated that they're black. I've seen people on EH say that they're a guy because they uploaded pictures of their face on their alt account (probably the SFW one) a while ago. Haven't seen any pics myself so I can't confirm that.
First of all, they drew a beastiality piece again. Just take a look at Kemono or EH, you can find that pretty easily. Also they recently drew incest again with Robin and Sunday from HSR.
I can tell you that they will do more extreme content from now on since SubStars policies are much more lenient than Patreons. They asked their SubStar subscribers for what content they'd like to see and there was stuff mentioned like light gore, NTR to the point where the MC breaks (Potentially in comic/doujin form), Cumflation, which they already did, raceplay (not just tattoos but also changing the dialogue for their alts like WingedWasabi does) and some more that I can't remember. Note that they didn't say that they will do every suggestion they get.
Much of the extreme content mentioned will probably be SubStar and Fanbox-exclusive content which will not get posted on their Twitter acc.
The QoS and QoH edits will also continue to be uploaded. Someone even asked if they will make their own QoS tattoo instead of only using a PNG pack found online and they agreed that they will start to experiment with that. No idea if they will get more extreme with them like doing BNWO stuff or something like that, as of now nothing has pointed to that being the case.
As for the Aether x Keqing stuff they drew, no clue if they're still on that ship. Not that it matters much, they are still an NTR artist, so it should've never come as a surprise. In this case it was a commission but they don't seem to care much about how "canon" it is in their Genshin AU, which is a mess anyway. There is a new WIP of a Keqing commission on their SubStar but I'm not subbed anymore so I cannot tell if it's another NTR piece or not. We'll have to wait for the pic or someone else to confirm that.
Also, stuff that they will draw in the future include Arlecchino with Freminet, shortstack Dori, as well as churled Arlecchino and churled Fjern (TWAQ's Genshin OC) from what I can remember.
They also will not draw that Nilou doujin, forget about that one.
That's all I have.