[Bibi]

Using a noogleberry could help to add more fullness at the top of your breasts, you can improve the shape if there is sagging. I think it would be slower if you only use herbs because you will probably grow at the lower part of the breasts first.
As for the tingling, I´m not sure but I don´t think you necessarily have to feel anything all the time, maybe someone else can advice about this.