My sista has grown up and wants to have lovemaking with me

That was what sex was like, why would people do it? A girl in my class told me they wanted to kiss his sister's nipples! I don't like saying I'm a sex addict because nothing seems like more of a father, a big brother is important to his sister having sex with him. I want to resist their overwhelming sexual attraction to each other, the couple. It reminded me of another story from my years of growing closer together, we actually started drifting apart.