She knows in general what to expect from her adventure but most likely prepared for pretty much anything and accepts everything that is coming her way, and in the process is getting really exciting which is pretty obvious from her facial expressions, sometimes pretty happy ones ;)
When she sticks her butt through the window she is trying to see what comes next and that creates composition similar to the picture on 1 dollar bill ;)
The entire video is 40 min long and full of excitement and action!

Melana is busty teen young girlfriend. One day she decides to surprise her boyfriend Alex. Alex is working really hard to earn enough money for their holiday. So Melana decides to help him relax. When he comes from work she's already waiting for him. She's reading a magazine but soon she gets completely naked and makes her tight pussy ready for action. First Melana has to make Alex's dick ready for her pussy. Watch how this busty young girlfriend goes on her knees and jerks off Alex's dick. She makes it rock hard and when Alex sees that his little friend is ready for action, he bends Melana over. He fucks her good and hard – he drills her tight pussy and he also sticks his penis in her round butt! Watch how this smoking hot teen babe gets fucked hard!