Dog filled me up

Hi im a 16 years old boy and probably gay. I found out the hard way. My Dog Champ was with me in my room and my Family wasnt Home. He was jumping me the whole time. Since he is a Rottweiler and im a skinny boy He was actually capable of overpowering me. Usally my father would Go with him for a walk but since No one was Home and i never did it, He stayed With me in my room. I was only wearing a shirt and my Boxershorts which were very loose. Sometimes i let him mount me just so He is done with it. I also kinda liked it. But never anything happened till this time. It happened really really fast. His dick came out this time, got caught up in my left leg hole from my boxershort and He immediatly went for my hole. The first strike probed me and a really nasty sting of pain let me jump Up. But He was holding me thight and pushed me back down. I screamed stop but it was to late. His second hump went in. He actually had left wet precum at my hole that helped him now as a lubricate. His dick just went in breaking every resistance while Holding me tight and pushing me down. I screamed in agony while He kept raming it inside me. I felt His dick geting bigger. I never knew this was possible. The knot of a dog is actually meant to hold dogs in place while fucking. I tryed to just lay down. i pushed my legs together and down but i could not get rid of him. His knot was already so big that He could not get out anymore and my try to escape made him only angry. He growled and Barked and pulled my ass up with His knot Inside me like a Shopping bag from the ground. I was in absolut agony and pain screamed and grunted but once He pulled me up and my knees were back under my hips, while my uppet body was still down in the ground i felt a strange tension Inside me. His Dick was like heater and remember He was cumming the whole time. I felt like a an ocean was inside me. But that wasnt it. My inner walls were squeezing so tight to his knot that it must somehow massage my prostate. I actually started to feel pleassure! A wave of orgasm came from my anus up to brain. At first it was just a strange inner "ich" that was involved with some kind of Electric tension and a feeling of embarrasment that came into my brain but right after that it became stronger and i immediatly reccogniced it as orgasm. I freaked out. And moant in pleassure. Wtf was going on. I was trying to hold it but champ was still thrusting like hell. My dick was rock solid now. I tryed to not cum. This cant happen now. But the moment i tryed to hold it. Bump...champ hit the spot i moant loud and my dick started to pulsate but had to Stop because of the knot. Now Something crazy was Happening i had an orgasm but my prostate and pulsating was restricted to champs knot and thrusting! I was only pumping and cuming when he was thrusting. But here IS the thing, He was fucking hard. I think i came 40 times. After that He Just stood there. Still pumping His load Inside me while i was twitching my load into the Boxershorts..WE were together like that for 20 minutes while i had Micro orgasms. And then He pulled out. I actually had to go to the Toilet immediatly and had the most painfull and disgusting shit in my life. But this was also the best sex i have ever had. I could Not sit properly for weeks. Roldmy Family i have hemaroids and used a pillow for weeks even in school. My Friends were actually calling me out lol. Saying that i just got fucked in the ass. Haha they didnt knew but they were right.
Should i do it again? Champ is ready.