Your skills prove too much

You have been going at her juicy dick for about 2 minutes now and you can already feel her cock flexing and tensing up before she lets out a massive groan and fills your mouth with cum, surprised at how long she lasted, or lack thereof you didn't know Futa's could cum so darn fast. Always hearing about the inhuman stamina that these girls had, only to find out that I guess some girls, or perhaps just the inexperienced ones can also finish early, through your thoughts she has already cleaned up and left.