It almost doesn't fit in my girlfriend's ass, but I manage to get it in

My girlfriend asked me a couple of days ago that she wanted to try hotter things in bed, and I immediately thought that I wanted to have anal sex with her and I ended up agreeing. Today was the day and, damn, her asshole was so tight. At first it was hard to put it in because I went in too rough, but in the end I lubed up my member and it went in smoothly and with pleasure.