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.