Tell her you play it for the story... (Old playboy excuse modernised)
Bad advice ahead (based on simply what I would do)
Are your family religious, and strict, but not that understanding? Go with - A short while ago I was losing my way, and I experimented with some things. I am finished with that now though. A lie, but one that should suffice.
Are your family religious, but not strict, not religious, or religious, and strict, but understanding - Go with honesty. Yes, I enjoy playing adult games sometimes.
Edit: If it is a serious issue, but you wish to continue playing, make sure to keep all of your adult games somewhere where someone would not find it - an external drive for instance. You will probably have to remove evidence of such things from your phone since, if it is serious, your mother will keep checking up on your activities.
I am always extremely careful in this regard, it is just that other porn games usually do not appear in the discord satut. I already honestly told what kind of game it was and lied that I saw it in the status of a friend (although I actually saw this game in the status of a friend) only my friend had it on Steam, I said that this is a fun game that makes you feel Especially, hinting that I played out of interest and analyzed the game. And my mother is very understanding, she's just still my mother and I can't get rid of shame here.
There are things that mothers should guess about but shouldn't know for sure)
After all, I now have another shameful hilarious life story.