Curiosity
I started to feel attracted to my little sister when she started to grow into a woman. At 15, she’s now so desirable, and she’s popular in school for being very, well, sexual. She’s very openly flirty in almost any context and almost with anyone... including me. When she told me she was curious about incest and wanted to give me a blowjob, I happily let her satisfy her curiosity.
Now, I’m addicted to the way she blows me, no other woman I’ve ever been with does it like her. She developed a liking to drinking cum straight from the source, and it drives me crazy to shoot my load right down her throat. She takes it like it is nothing. We’re very tempted to take things further, but we’re not sure. Blowjobs are “innocent” enough by comparison, but man, how I’d love to be all over her and fuck her good.
For context how old are you?
You need to be eating her pussy. Do that for her and she will be ready to fuck.
You have got to try her ass!
Take your experimentation further. Finger and lick her pussy. Masturbate for each other. Then fuck her. You're only young once. Enjoy it while you can