Things I get up to when home alone?
Turn the telly off, put some music on. Have a sing song or a bit of air guitar/drums to a cool track! Watch a manga or anime film maybe. Perhaps watch some mind numbing comedy shows on TV like Friends, or Porridge or Only Fools. Mess around on the computer, play solitaire.
I am soooooo interesting! Lol!
[Edit] Just remembered that I actually used to use my suction cup anal toys when I was home alone, back when I could enjoy it. Never anything bad though or particularly secret, I just didn't want to think about the possible dilemma of my partner entering the room and finding me naked, bent over with a butt plug halfway in my bum, when I hadn't talked to him about my new-found enjoyment yet!