Your sister has a winkie? Hmmm, interesting.
Anyway, unless you two were sexually active with other people at age 10, then no, I seriously doubt you got an std from her, or vice versa.

Whats a winkie?

Are you a brother who touched winkies with his sis, or 2 sisters, or what? Are you more than 2 years older than your sib?

You are freaking out for a. Touching winkies and b. Thinking there might be a physical consequence therefrom

stop teasing this person is young and needing some de-shamification

some minor sexual experimentation as long as it's not abusive or coercive or penetrative, just exploratory...This is normal to a small extent even amongst sibs, playfriends, before puberty even
you'll know if you did something you both did not agree to...
The chance of anything being exchanged is virtually nil, so stop worrying about a disease...
Just get straight with yourself over the winkie thing, was that in the wrong? If so, you need to go apologize and maybe you need help, or if it was innocent stupidity, just get a red face and know lots of people to stupid things and don't worry so much

I meant like we took baths together when we were like 7!! Nothing like what u guys think. Nvm anyways it was a joke

Go away, you annoy me.