YOU SAID:

I masturbated on my mom's unckeuncle for a while and she basically told her that she wants to know who are you what are you doing to my uncle

INTO JAPANESE

私はしばらくの間お母さんの叔父さんで自慰行為をしました。

BACK INTO ENGLISH

I masturbated with my mom's uncle for a while.

INTO JAPANESE

私はしばらくの間、母の叔父と一緒に自慰行為をしました。

BACK INTO ENGLISH

I masturbated with my mother's uncle for a while.

INTO JAPANESE

私は母の叔父としばらくの間オナニーしました。

BACK INTO ENGLISH

I masturbated with my mother's uncle for a while.