Stepfather didn't notice anything wrong with what would happen under his nose

After the divorce, the task of taking care of his stepdaughter remained on him and as there was never much time left and even the ability to help her with her studies, he ended up inviting one of his best friends who was almost the same age as his stepdaughter, to be able to help her with her college subjects. As his stepdaughter really seemed to have improved well with her studies, he didn't even imagine that the best friend he had asked to help his stepdaughter, was putting his cock in her daily inside the house...