I've seen your pics, Haagen, and can tell you with a cock like that, anal may take a few tries. The first time I tried it was with my then girlfriend. She really wanted it, but we still had to practice, going a little further every time until she could take it. Of course, niether one of us were very good at sex at this time (we were 16 or 17, somewhere in there)
Now, my boyfriend and I trade off fucking each other, and he's about 10 inches long with a nasty curve. I completely love it, but it took 3 tries on different days before he could get totally in me and stay for 15 min or so.
As to how it feels, the girl I did it to said sometimes she didn't like it because of the pain, but she came harder than she ever did when I was inside er from behind. The same for me, when I'm being fucked. The most intense orgasm ever. And I have to agree that anal is tighter than vaginal at first, but then loosens up. The big advantage for me is you can bend her over in different positions, so by changing the way she's bent and by switching betweem the front and back doors you can hit every conceivable angle.
But seriously just be aware that you can really hurt someone with that incredibly massive tool, lol. so go slowly