I don't know how I get myself in this situation

I've went back to this guy's house and once I was there I absolutely regretted it

I had met this guy while I was out and I've went back to his thinking that he was going to fuck me and that would be it
But I didn't know that he was wanting more than just a fuck
I'm basically in the living room kneeling down in front of him between his legs as he's got his jeans boxers down below his knees and I'm between his legs leaning over towards him with my mouth down around on his cock.
I'm giving him a blow job it took ages to actually get him to come my arm was knackered and my jaw actually hurts with having it opened for so long
But I managed to get him there I'm still kneeling down between his legs looking at him as he's just saying that felt good thanks
I'm getting up and as I'm getting up he's basically pulling down my legging pants and taking them down to my ankles, I'm standing there with my fanny in his view
As he's got himself up from the sofa and he's putting me over the sofa so my stomach was down on it and my bum up in the air as he's behind me pulling me closer to himself and he was pulling my bum cheeks apart and pushing himself up inside me.
It felt big as he's pushing himself up inside me
He's fucking me so hard my head constantly hitting against the back of the sofa
As he's fucking me he's slapping me on my bum cheeks really hard
It felt sore in the way he was slapping me it wasn't very nice
After a while he's stopped he's pulled it out of my fanny and he's pulling my bum cheeks apart and he's actually putting it up inside my actual bum hole he's fucking me up inside my bum hole
I've never done it before I wouldn't let anyone do it and here I was getting fucked up inside it
He's fucking me in the way that he was fucking my fanny it was really sore and he's still slapping me hard on my bum cheeks
He's actually stopped now and he's just pushing himself up deeper inside me holding me tight on my shoulders
I thought I could actually feel his come running out of my bum hole as he's pulled his cock out
I'm standing up pulling my knickers up and legging and I'm basically making excuses for leaving I'm getting out of there as fast as I possibly could
It felt all wet between my bum cheeks and very uncomfortable now it was really sore
It was sore on my bum cheeks with him slapping me so hard
I got home I'm in the toilet having a shower my bum cheeks where all bruised I even had his finger printed on my bum cheeks