Total fan here! Just like you, i don't exactly know what it is that i find so unbelievably sexy, but i sure do! Probably the way she looks into the camera all the time while taking care of Mr. Klixen's dick.
More the old Daniela, then the 'newly re-constructed' one though, her newest boobs are way too big for me.... But still, when she whips them out and sucks cock like in 'smoking blowjob 2', i go madd!
By the way: she does lots of fucking on this page:
Not nearly as good as her Klixen stuff IMHO and also really bad quality technically...