The backdoor experience

This guy has a big thick dick head and when he starts fucking his girlfriend in the ass for the first time she can barely take it. She feels the pain as he eases his cock into her tight rectal hole, but once her muscles get used to it a whole bouquet of new sensations takes over her body. She wants more and more and the guy fucks her faster with each penetration making her moan out loud and cum harder than ever before.