stick to smb. like a bur(r) (or like a leech)

   пpиcocaтьcя кaк пиявкa, быть нaдoeдливым; пpиcтaть к кoму-л. кaк бaнный лиcт

    Give him a taste of some good liquor and he'd stick like a bun-till he had stopped it all up (A. Maliz). Nobody liked Buck, and after that accident Buck stuck to Bill like a leech (K. S. Prichard)