Step friend called me into the room

Step friend called me into the room And she said my boyfriend does not know how to fuck, will you help me, then I said if you do not tell anyone then I will help you, then she agreed that she will not tell anyone, I said okay then both of I told her to slowly take off her clothes, then both of them kissed, then both of them had sex as per their wish, both of them enjoyed it a lot, she said that you are very big, we will do sex again sometime.