Listening to sex stories and the length of intercourse

As-Salamu `Alaykum warahmatullah wabarakatuh (May Allah's Peace, Mercy, and Blessings be upon you).

My problem is embarrassing and I hesitated to ask, but my silence affected my marital life badly. I hope to find the solution as soon as possible because I have suffered a lot.

I have been married for 4 years, and at the beginning of my marriage sexual intercourse was so intimate between me and my husband and I gave birth to a boy who is now two and a half years old.

A year or less the relationship started to take a strange turning. My husband keeps asking me to narrate sex stories during intercourse. Sometimes I refuse under the pretext that we might get used to that because it has become a routine for us, and the sexual relationship is not completed without it. However, he insisted to use this way and if I refuse, I do not satisfy his wishes.

On the other hand, sexual intercourse now lasts for about three hours and it always happens at late night when I am so exhausted. I feel that I have to do a hard homework to fabricate a sex story every night? I do not feel any joy in what I am doing.

I never thought about counseling but when I reached the stage of hating the sexual relationship with all senses of the word and I started to use excuses to escape it, my husband noticed and sexual intercourse has become a hard duty. I cannot imagine that sexual pleasure may last for three hours. I always try to draw his attention to new methods of enjoyment but he likes this method and does not want to change it. I tried more than once to speak frankly with him but he is so nervous and he always says: I do not want anything from you if you do not fulfill my wishes.

Could you kindly advise because I reached a terrible state to the extent that I cry during sexual intercourse and sometimes I wish for anything to happen to stop or escape.

I cannot go to a doctor to tell him that.

Thank you.