Anal cum swallowing

What do you usually do with the cum that is left after masturbation? I think usually you just throw it away. But your body has worked hard to produce that cum. And the cum gives you an orgasm when it comes out of your balls, prostate and seminal vesicles, when it is released from your dick. And I collect my semen in a glass to return it back to my body. It would be too easy to swallow it with your mouth. And I prefer another way. I inject my semen into my ass. All the semen I collected. And hold the semen inside. And if I ejaculated at night, then in the morning all the sperm is completely absorbed by my rectum. I just fart and not a drop comes out! All my cum returned back into my body!