Spy X Family: I Got Drunk and Slept with My Best Friend's Little Brother

My senior is the number one ranked killer. People tease me as the perennial runner-up, but I truly respect and admire her. (Obviously. She punched a bear to death, making her the modern-day Wu Song.) She's always looked out for me, too.

She got married not long ago. I was so happy for her that I even gave her a wedding present. She was delighted and introduced me to her husband and adopted daughter. I don't have many friends, so I was thrilled to become her best friend.

That is, until I got drunk and slept with her younger brother.

He's three years younger than me, a secret police officer, and, most importantly, he and my best friend have always depended on each other. I wouldn't dare tell my senior that I'd slept with her only family member and planned to run off afterward!

So here's the question: how can I sleep with my best friend's younger brother without damaging my friendship with her, and maybe even make it stronger?

Answer: Marry her brother and become a real family.

Me: ...

Content warnings

1. The female lead isn't a virgin. She's a total scumbag, smokes and drinks in private, and is pretty wild in bed (?)

2. Keywords: 4i, girl/boy

3. If you don't like it, click away. Don't start a discussion. I'm giving this story away for free, so cut me some slack (but do tell me if you spot mistakes. If I see your comment, I'll immediately get on my knees and fix them).

4. The female lead really is a scumbag. She's the type to have several relationships going at once.

5. Yuri might not be as obsessively devoted to his sister as he is in the original. I've always believed a single label can't define a complex person, and Yuri has more to his personality than just being a sister-obsessed brother, so he'll be a little more normal (What are you even saying?).

Theme: Don't marry a man who wants to tame you