The artist behind this work is credited as "Zheng Yi". However, I could not find any first-party sources. Only this shady coloring game. If anyone can locat the original and upload it (or at least let me know it's there), that would be much appreciated.
Huh, he drew PC-98 versions of Reimu and Marisa, but Windows Yuuka.
It's because Touhou girls store their identity in their headwear. Reimu's always identifiable if her hair tubes are visible, as they are here. And Marisa's got her hat. But Yuuka doesn't typically have anything on her head, so it's harder to identify her if the outfit's different than the usual. Hence, Using the more-common Windows version as a compromise.
You mean the one where Mococo is shocked that the condom broke? With nothing implying she intentionally damaged it? Unless you're suggesting Fuwawa did it, but there's nothing suggesting that either. Condoms do just break on their own, you know, that doesn't mean it was tampered with.
If you can't visually identify that the condom has been tampered with, and you can't, it can't be tagged sabotaged condom.