A woman caught her sister sleeping with her husband

U know ehh for a lady to have the mind to do this to her own blood sister, then there is nothing the lady cannot do. should i say the lady slept with her sister's husband for money or she loves her siste'rs husband.
According to the story, the wife of the man has been asking her younger sister where she get's the money in buying expensive phone and clothes, as she was yet to bring any man to the house as her boyfriend or lover since she came to Lagos to stay with she and her husband. little did the woman know that  her husband was the chief  buying those gift for her sister.
Not until the woman's friend told her that she was suspecting her sister and her hubby who is a building contractor, due to some 'moves' she saw them making secretly...

Every thing came under the light last week when the woman told them she was going to the shop and will go to Lagos Island market to buy some goods to restock. Her sister and husband saw it as yet another opportunity to do their normal stuff.
But the woman stayed around, in less than 15 minutes after she left home, her husband and sister were already dancing  "do me i do you" Lol  in the room. the woman came back and walked straight to bed room.
The wife tried to force the bedroom door open but her husband blocked it until her sister wore her pants. The woman still grabbed the sister and gave her the beating of her life, with both almost going nude.