My first time fucking tight ass

As I was having sex with my wife, I asked her can I fuck you from behind? (I met doggy style). No hesitation and she got into 4' and grab my hard cock and I see she was trying put in her ass. I never fuck ass before and she says it was her first time too, I got little nervous but I could see she was excited, which makes my cock harder. When she puts it in to my surprise it was so tight, cock enter partially and slip out, second time try again and slip again, I could not believe how tight it was. Third attempt was successful, she told me to go slow and easy, gradually getting deeper and deeper. After it was all in, she suggested I can penetrate her now, it was so tight I thought I was going cum in no time!. After few minutes I pull out and I want go to missionary position but I had little trouble enter her ass again, her pussy was soo wet (turn on from ass penetration?) so fuck her wet pussy and try again her ass, this time my hard wet cock enter her ass easy. We were fucking passionately and I told her I'm about to cum (she was coming at the same time) no fuck me harder I'm coming! This really turns me on and I fuck her harder and deeper and she was moaning. I could not believe I drain all my cum inside her ass!