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http://www.bustysx.com/series209/worldsex02.html

who is this black haired woman???

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Very familiar [as is the blonde], from Pontello or HSM efforts.
In a 'Faust Fucker' title?

both chicks appearing together in "Heisse L?cher hart gedehnt" (Videorama/Faustfucker) the blonde could be "Andrea Rabatinova" (she is introduced as "andrea" to dr. fist in those faustfucker movie, while the other andrea credited is zara lindner) aka "Tilly Pecker" for dbm. the dark haired woman is credited as "Donna Kubick" in a small "starring section" included in dbm's "Am Limit" dvd.

Ah, yes. Tilly.
Cast: 'Andrea Hercogova [Zara Lindner], Sabrina Zampieri, Andrea
Rabatinova, Monika Hendrychova, Katerina Mikalasova'.
Apart from Zara, Tilly and the unknown brunette the other females present
are Alice Wander and Sabrina Kelly. Which alias matches which girl is
anyone's guess.

In 'Am Limit', by elimination 'Donna Kubick' is the brunette in question.
BTW, Alica Wonder does NOT appear in 'Am Limit'.

Thanks