Lapis was hit by one of White Diamond's laser's...now she had white skin...her hair grey and her assets grew she was under White Diamond's control...she was sent after you...to convert you...and make you like her...you heard a knock on your door...when you opened it...it was Lapis...

"You will join me~"

She grabbed you forcing your head onto her breast's...she charged up a white beam of light from her eye's...if it hits you you'll be converted like Lapis...