1. no alcohol, no drugs, no rape.
2. conservative mother, looking young, widow or divorcee
3. hasn't been with a guy for a long time, all her relationships ended quickly
4. appearance - slim but with firm breasts and a large, shapely ass, a strip of pubic hair over her pussy
5. assertive, guys are a little afraid of her, strict but fair to her son, lawyer, doctor, high-ranking official, etc.
6. son is subservient to her but is not bullied by her, son is intelligent, but calm, modest, he is not an idiot, he likes mature women
7. mother wants the best for her son, wants him to finally become a man
8. a friend of the son appears, who has a good relationship with the son and who begins to frequent the mother and son's home, he is not as handsome as son, he is rather ugly but has a strong character
9. he gets closer and closer to the mother, she often talks to him, the mother always takes the friend's side in case of his rivalry with the son, she gives money to the friend, hugs him, allows herself to be massaged by the friend, lubricated with suntan oil, etc.
10. the son begins to be annoyed by this, the conflict between the son and the friend grows
11. there is a fight between the son and the friend, the friend is stronger and begins to dominate in his home
12. the mother likes the strong character of the friend, the mother falls in love with the son's friend
13. the son confesses to his mother that he does not want his friend to come to their house
14. mother disagrees, an argument ensues
15. mother fucks her son's friend
16. son discovers intimate relationship between former friend and mother
Such a story would be more natural to me than a cruel bully tormenting son and fucking his mother.
Instead of a friend, there could be a nephew who became an orphan and was adopted by mother, who in time devotes more attention to him than to her son.