Fill a condom up with luke warm water and tie it off at the end. Make sure you don't over fill it, it should still be penis shaped hehe. Now, make sure you use lots of lube and you slide it so far up your ass your ass closes behind it hehe. Now you have to leave it in there and carry on your day to day until it finally bursts
You never know, you might even forget its there
Good luck babes.