"Batgirl was standing at the edge of the harbor basin. She was still tied and gagged thoroughly in the same the way the gangsters had left her, when they fled at the sight of Nightwing on a bulding across the water. But for some reason he didn't come over to free her, he just stared through his spyglass... When Robin finally joined him on the roof about 20 minutes later he still hadn't moved a muscle. The only sound that disturbed the silence, was the the dripping of blood from Nightwings nose..."

I made the original pic about 2 years ago. In the original picture it was Batman, not Nightwing who stared at Batgirl. I always thought that was a bad decision, since it didn't really suit him. Nightwing on the other hand, who later has an intimate relationship with Barbara Gordon (Batgirl), suits the role of the stunned bondage-fetishist alot better.
Addionally I colored the lineart to improve the overall appearance of the picture.

Technical background: I drew the lineart with a common pencil and traced it for cleanup. I scanned the final lineart and colored the picture digitally.