The English language has no relationship term for the wife of your cousin's brother. You are not considered to be related to her.
We call "Mami" to moms brother's wife.
Shwe would be your sister-in-law.
Your sister-in-law.
Your brother's wife's cousins are not related to you and the English language has no special term for that. The same applies to the cousins of a stepbrother's wife.
Why would anyone want to sleep with their cousins wife? Are you perverted or what?
You would refer to your younger brother's wife as "bhabhi" in Hindi.
That would probably be your cousin-in-law.
Your brother's wife would think of you as her brother-in-law and when wanting to get your attention will simply call you by your first name. If she is introducing you to someone she would say, 'This is my brother-in-law ____.'
A hoe.
In genealogy terms she would be "spouse of your first cousin."
If you are close to your step-brother, or to his wife, you can call her your sister-in-law. If you are not close, you can call her your "step-brother's wife."
aunt