Story how Vishnu and Lakshmi married. (Parvati in the URL is a typo)
http://hindumythologyforgennext.blogspot.com/2011/10/how-lord-vishnu-married-goddess-parvati.html
Story how Vishnu and Tulsi married.
http://utkarshspeak.blogspot.com/2010/11/tulasi-vivaha.html