Father does not know what his son does with his guardian

He was her tutor, chosen by her stern father. but what the man would never have imagined is what the two of them did in their room. they usually had the door latched, according to them to avoid distraction. but they had it that way so that their father wouldn't come in and catch them taking it up the ass like only the two of them know how to do. of course if you found out about this you would think that perhaps you are not investing your money correctly. although her son looks much more than happy fucking with that mature man.