Lock the main door with key, maje sure he has a spare key.
Now get in a specific position all naked with ears phone plugged in with the music of your last sex moans or lines like "I am a worthless slut for masters pleasure" on repeat.
Make sure you cant hear other things when plugged in, and you are blindfolded.
Start doing this before half hour of his arrival, so you wont know when he gonna return, or have return and left you there while he is taking shower, letting you stay there to your doom.
And if he return and put a dick in your mouth or other holes. You wont know who really fucked you. Or how long has it been.
Ofc there are some flaws.
As he is the only person with key so no surprise on who fucked you.
The position is hard to maintain so you wont last lost with all the pain.
Pm me for position.
Your hands are not tied up so you can get up, so you can cheat