help with young step sister

[bubbag...@gmail.com]

hello my mom has been dating this guy ( we live in a 4 apartments building and we live across the hall) and he has a daughter that is 8 yrs. old I'm 14 almost 15 and a few days ago while my mom was over at his house watching a movie she came over and me and her was playing ( I was dragging her around like I always sometimes do but she always wrapped around my leg and I would try and see how far I could go) but this time I just pulled her by her hand and cause I was lazy and when I was pulling her it kind of felt and looked like she was pulling my hand by and on her boobs ( which were pretty good size for her age) and then my mom and her dad took a break from the movie so we quit and later on we were playing monopoly and we were half way in the game and my hand touched her thigh ( we were sitting on the floor) she didn't say anything so I didn't move it and every time she moved her piece her butt ( and this butt isn't saggy it was also a good size) was in my face like an inch or a inch a half, and she always does stuff like that but I was wanting to know how to do the stuff below without getting in trouble or her telling someone else and please no hate just advice or story's that could help thanks
* dry humping
* fingering her and or licking her vagina
* kissing
* her maybe touching me down there
and also how or could I do these if my mom and her dad broke up or something and thanks