Nereel was a native girl from the Savage Land. Her friend Shakani and herself were saved by Colossus from a thunder lizard and shefell in love with him. A short and passionate relationship followed while Colossus stayed in the Savage Land, most likely with the two having sexual relations.
Nereel was created by Chris Claremont and John Byrne and first appeared in Uncanny X-Men issue 114 (1977).
Major Story Arcs
Reunited with Colossus
Colossus later return to the Savage Land and saw a much more matured Nereel, now head tribesman. She also had a young son also named Peter (although Colossus was never told about his name). Although it was never acknowledged, it is strongly suggested with many hints that Peter jr. is the son of Colossus. Despite this, Colossus never had any knowledge of his him being a father. Longshot deduced that Colossus was Peter jr's father, but promised Nereel not to reveal this to Colossus.
Mr. Sinister , who has shown interest in the Rasputin family, is unaware of the existence of Peter jr.