Bi guy 49 here. Oh yeah and a bear to boot. This happened some years ago and back then I was a slut, and I will gladly admit that. Having said that, I was the bottom and I like it that way. 
Although I was not on Grindr, i was on a similar site.
I had for some time been looking for a guy to fistfuck me. Obviously he couldn't have hands that was too big. I mean, I did want to be able to walk properly after that, so I passed on a few guys. But I never let them leave without a blowjob. I mean, so sue me for loving to suck cock and from what I have been told, I was pretty good.

Then about a month goes by without a prospective lover looking for someone to fistfuck. Out of the blue, I get a message from a guy in Oslo, who wanted that ans so much more. He felt that his boyfriend running around was ruining their relationship. So, I said sure, come on over. I gave him my adress and on the dot the next day, he came. He had driven for over 2 hours to meet me.
We had agreed that I would meet him naked.
I was fine with that. Not the first time.
Although I was shocked to find that he was someone I already knew, I still let him in.
He was also stunned when he realised who I was.

I asked him, if he was uncomfortable with me, he said no. I told him that I would do whatever he wanted me to do, except scat and wet.  Even though we had been friends in college, we never knew about our kinky selves.
We were both pretty straight in college.
Anyway, I told him to strip and be naked with me.
He acquiesced and stripped. I could tell that he had showered just shortly before he came to me.

I like that in a partner. I gingerly leaned in to kiss him on the cheek and he turned his head quickly, so I ended up kissing him on the lips.
Apparently that was all it took.  He just looked at me and just asked if I was willing to be fucked by him. I said yes, obviously and then we went to the bedroom.
We laid down and he started to kiss me and I loved it.
He started to kiss my lips and then my nipples. He then took my cock and started to jack me off before he went down on me and as I came, he sucked me dry before he licked my cock dry. Don't get me wrong, I love getting my dick sucked. 

After he did that, he told me that he did it because he wanted to fuck my brains out, as well as fistfuck me.
By now, I was just in a daze. He could have called in a football team to fuck me bareback and I would have done it, no questions asked.
He was liberal with the lube, thank goodness. It turned out that he had a sleeping monster between his legs. And when it woke, I was in for the fuck of a lifetime. 
He let it gently slide into my butthole and away he went. 
First slowly, then like a jackhammer.
My ass was seriously pounded. And when he finally came, I got a warm feeling. He was into some seriously weird things, as he pulled out and started to rim me.
He was licking my ass clean. 
After he was done lickiing me, he took a piece of bubble gum and kissed me.
Was I any good,  I asked him. He said that he had secretly wanted to nail my ass in college. So yes, I was apparently everything he wanted. 

Bare in mind that I was still sort of recovering after that jackhammer pounding. 
I told him to fistfuck me if he wanted to.
Again he lubed up and carefully started.
The first two fingers went in easy, as did three and four and eventually all five. Then he got all of his hand inside me. I was getting high from this, seriously.
He started and after a while my ass was literally numb and I loved it.

Somehow he was able to activate his phone. And as he was fistfucking me, he called a friend and he had apparently been in the car with him. He had apparently been waiting this whole time while we were busy. 
He came into the bedroom naked and while my friend was fistfucking me, he asked me casually if I wanted to suck cock and I just nodded. I had a fist up my ass and a cock in my mouth. He even deep throated me to the point of me almost choking but I was so high, for lack of a better word, that I was fine with it, as bizarre as that might sound.
He ejaculated and I swallowed everything. Afterwards he bent down and kissed me.
My friend changed out his fist with his dick and I was like a junkie getting his fix.

I ended up being fucked to the point of exhaustion. They left a little over a hundred pounds on my nightstand before they left, with a note asking for a repeat in the future. They also included a phone number for me to call, when I was ready.

I am more than well aware of how this all sounds, but it's true.