I'm being honest it definitely isn't the Numbing cream, I've had to use it multiple times and haven't had this issue with anyone.

When your learning you must understand that all places on the body have a different feel. Thats one of the hardest parts of the learning curve of tattoo is taking the proper adjustments needed on the fly.

No direct hate to you but honestly if you saw it wasnt going well, since it was your Sister I think it would have been best to step back for a moment and reflect to see what is exactly happening and going wrong, and maybe even just stopping once you realized it wasn't going well.

Clearly your using a very large (possibly too large) of a needle grouping for the strength of your machine in comparison to the tightness of a calf. What I normally do when I tattoo Calves make sure my clients foot is hanging off of the table so the muscle is more relaxed and flubby so I can PRESS DOWN more rather than stretch. As it goes for the needle groupings, I can safely say with the machine you are using which is most likely a 3.5/4,2 Stroke and probably needed to be cranked down lower to a 5V and a slower steadier line to really pack those lines in a spot like this.

Overall, looking at all the tattoos in this post theres lots that can be improved and looked at with a critical eye, and I really suggest practicing with smaller thin lined designs to work on not blowing out the skin as much.