Is it normal love tickling my girlfriend now!

Last week I tied up my girlfriend in bed. We'd always wanted to try it and we finally did! (We've been together two years.) So I had it all planned for her. Big bowl of ice cubes and both her toys. (She can't handle just one of her toys all the way to the end without literally throwing me off the bed but now that she was tied up I used both on her and drove her insane!) Anyway as I kneeled over her hips she was giggling in anticipation and I got the idea to tickle her! I tickled this poor woman literally from head to toe and drove her completely out of her mind!!! She started off yelling at me but was soon promising me whatever I wanted to stop! I went back and forth pleasuring her and tickling her for over an hour! (I even used one of the toys very lightly around her clitoris after she'd had one which tickled her so bad I thought she was going to pull her arms out of her sockets thrashing and trying to get free!) By the time we were done she had climaxed five times and then she slept for seven hours! So since then I get SO turned on by tickling her or even thinking about it. She'll be working in our office (she works at home) and I'll come home, "kidnap" her out of the office, tickle her crazy, and then we'll head to the bedroom for the good stuff, LOL!!! I can't believe how excited this gets me...Is it normal or am I going down a road I shouldn't (whips and chains and stuff)? Right now it's just the tickling and tying her up in bed but I don't want it to turn rough. Thoughts?