Son can't ejaculate so mom lends him a helping hand

Chris has been in the hospital from a bad accident and is paralyzed from the waist down. Because of his circumstances and it being so soon after the accident, the only way he can be discharged from the hospital is he has to have someone stay with him so he agrees to stay at his mother's home. Ever since the accident Chris has had constant erections but no matter how hard he tries, he cannot ejaculate. Chris is laying in bed at his mother's (Carol) house when she comes in to tell him goodnight and leaves and shuts his bedroom door. A short time later she walks by his bedroom door only to hear him yelling something like this. "fuck me, why can't I cum?! Fuck it hurts and won't go down!" Not suspecting Chris is talking about his cock, his mother Carol rapidly knocks on the door and walks in only to get the shock of her life when she sees is large erection. He stammers and stutters until she asks him what's wrong? After he finally explains the problem he is having, she's extremely nervous and hesitant and explains while it is extremely wrong, she will give him a hand job but that's as far as she can go. She's extremely hesitant but finally start stroking his cock but when he still can't cum, she decides to give him a blowjob but once again explains that's as far as she can go. As she began sucking his cock, she begins to get highly excited and opened herself up to the possibility she might have to go farther than she expected. When he still doesn't cum, she starts to disrobe and makes him promise he can never tell a soul what she's about to do. She then climbs on top of him and begins riding his cock with her back towards him and when he still doesn't cum, she turns around to face him and rides his cock vigorously all the time moaning about what a fantastic cock he's wielding whereupon he begins to play with her breasts. She might even say things like. "Oh Jesus me Chris, your cock is so much bigger than your father's. Oh my, mommy can't get enough of your big cock! Oh Chris, it's like your cock was made for mommy's pussy!" His mother gets so lost in the moment, she starts to orgasm and without warning he starts cumming inside of her. Chris begins to panic but she quickly calms him by saying something like. "Don't worry, I think it would be fantastic to have your baby. Don't you think it would be wonderful for mommy to have your baby? Don't worry Chris, if you didn't get me pregnant this time, we can keep practicing until you do."