You were a witch. Pretty much the only witch in Sunnydale. You were pretty experienced due to your parents already being familiar with magic and spells etc. You're on the good side, luckily, as you're pretty powerful. Giles knew this. As a Watcher, he often asked for your help, even if you were barely an adult...

So now, you were in the library with Giles, Willow, Buffy and Xander, as they help you complete a protecting spell for Sunnydale, in particular. They watched you do your magic, all really interested, but Giles most of all. Not in the magic though. He was interested in you. He always found you pretty, and your personality, too, but he knew with his luck he'd just mess everything up. He has never been good with love. Most women just called him a nerd and a bookworm. Hell, he didn't even know if you'd wanna be with him, due to the age gap and such...