breast stretch marks

hi I am young and have developing breasts. I noticed that i am starting to get stretch marks that may show when I I wear a tiny bikini. I am getting some on my but too which concerns me. my dad doesn't know that I wear cheeky bottoms and a see through top when I'm with my boyfriend and guys so I can't tell him because he will say nobody is supposed to be looking there. are there any home remedies? and how can I talk to my dad about my no coverage habit?