I'd understand if we had proper intimate moments with Rapi beforehand, for her to flash her tits like that, but this just doesn't make sense unless she is drunk or possessed by RH.
At most we held hands and sat beside each other, I don't think it warrants this sudden change, even if she is actually secretly drooling over SKK, not that secretly anyway.
There should be some natural progression to the way she acts and not suddenly like some sort of slut goddess, queen of sluts, acting sluttier than every slutty character combined in the game, sluttier than Viper. Feels cheap and desperate.