Authentic Edo period original, c.1835, Japanese erotic art shunga woodblock print picture by Kunisada Utagawa (1786-1865).  From the shunga series, Kari no fumi.  
Shunga picture measures 22.2 cm x 15.4 cm.  Excellent colors and impressions!  Condition is good with a bit of wormage, some wear and soiling.  No backing.  Please see and judge from photos.
 
Part 1 of 2 - A young pervert masturbates outside in the rain at the window of two lovers at night.