Go find one of the dildos that was violating your ass earlier. First, take that dildo and use it to rub all of the cum off of your face so that the dildo is coated in your man juices. Next, take the cum that has been in your mouth and spit it all over the dildo. Don't worry, the taste of your cum will remain in your mouth. I know how much you love that taste.
Now reach back with one hand, spread open your asshole which should still be gaping from all of the fucking that it has endured today, and begin fucking yourself with the cum-covered dildo. While the warm cum is a great lube, the object of this fucking is to get all of that cum into your asshole.
Fuck yourself for a few minutes. Then, take the cum that has gathered around the rim of your hole and use your finger to jam into inside of you.
Can you feel the cum inside your ass? It is just like someone had fucked you and shot their load inside you. Is there any greater act of submission than to allow someone to shoot their cum inside you ass?