I feel the story is incomplete, MC has GF, he follows her and finds she fucks with his own dad, then MC gets even rougher fucking his GF and she likes it. end.
My childhood classmate is a girl who is somewhat defenseless and has a tendency to jump to conclusions. Due to some unfortunate circumstances, she mistakenly thought that I knew her weaknesses, and she became an obedient woman who let me use her pussy as much as I wanted
However, I wasn't the only one who knew her weaknesses. Right in the next room, father was holding her so hard...