Suggestion: Aqua net hairspray! (Something about the alcohol in it I believe.)
According to Heloise:
Inks: Caution: Regular laundering removes some types of ink but sets others. If you have doubts, take a good garment to a professional. Also some inks require color remover and some permanent inks can't be removed.
Method 1: Pre-treat first by placing stain facing down on paper towels and then sponging the back fo the stain w/alcohol or dry-cleaning solvent. If some ink remains, rub with bar soap; rinse; launder.
Method 2: Dampen stain with water and rub with bar soap. Rinse. Soap in enzyme detergetn or oxygen bleach in hottest water safe for fabric; launder. If stain remains, launder again with chloine bleach if safe for fabric.
Method 3: Dried Ink Stains: Rub non-iodized table salt in and dribble lemon juice over the salt. Launder after train is gone.
Method 4: Old Wives Tale That Works on Some Fabrics: Soak ink spots in warm milk before they can dry. Then launder as usual.
Other Sources:
http://www.azcentral.com/arizonarepublic/home/articles/06...
http://www.ehow.com/tips_17962.html
http://www.ehow.com/tips_3138.html
http://www.washingtonpost.com/wp-dyn/content/article/2006...
Or put "Removing Ink from a leather couch" and see what other links pop up if the ones above doesn't work. The Heloise one is more for ink stains on clothes moreso than leather furnature.
Hope this helps!
A.