Is sucking and pressing bad for breast or it may lead to breast cancer at the time mensuration?

No, sucking and pressing isn't bad for your breast, and it won't lead to breast cancer.

Women should talk with their doctor to determine their specific risk of breast cancer. All women should perform monthly breast self-examinations. Clinical breast examinations by a doctor should occur at least once every three years for women 20 to 39 years of age. Beginning at age 40, women should have yearly clinical breast exams by their doctor and yearly mammograms.