Anna and Tristan kiss and remove clothes. Scene jumps to them in bed, she's on top of the covers, wearing only panties, presumably after sex. Her breasts are very briefly shown as she adjusts her position to move closer to Tristan.
Much later Anna is shown lying on her back in bed in just panties. Breasts clearly shown then and more as she walks around topless.
Sex scene with Anna on top and breasts shown clearly as she moves and pants.