‘ I love kids, and I feel I have so much to offer,’  I replied, delivering the line I’ d spent ten minutes rehearsing outside the Big Sister offices. ‘ It’ s been a lifelong dream of mine to be a mentor to a girl-to share with her all I have to give.’

Rose nodded.

She seemed to be buying it.

As director of the Los Angeles Big Sister program, she was in charge of interviewing potential Big Sisters-weeding out the felons and any weirdos who were in it for the wrong reasons. While she went over the particulars of being a Big Sister-a ‘ Big,’  was how she put it-I sat smugly, congratulating myself on my clever plan. Susan had said I couldn’ t handle the task Change someone’ s life on my lunch hour, but here I was, noon on a Thursday, doing just that. Or at least getting it started.

The idea had come to me as I’ d ridden the bus home the week before. Gazing out the window and listening to Whitney Houston on my iPod-volume low so the hip-looking guy sitting next to me couldn’ t overhear-we passed a billboard for the Big Sisters program. In huge type, it announced: ‘ Change Someone’ s Life-Be a Big Sister!’

Talk about your signs from above, literally.

I filled out an application online as soon as I got home. Okay, after eating dinner and browsing on eBay for new sunglasses. Still, the speed at which I pushed the idea forward amazed me, considering that changing someone’ s life struck me as the most difficult task. It’ d take time. Perseverance. The type of thing I’ d usually put off-avoiding the hard things until it’ s too late to do them right, or to do them at all.

And yet.

If all went well-and Rose had seemed mighty impressed that I worked as a writer, even if it was brochures-I’ d soon have a Little Sister of my own. The idea of a sweet, freckled little piece of clay, eager to be shaped and molded, made me giddy. I’ d buy her balloons and take her to pet ponies. She’ d gaze up at me, her tiny hand clutched in mine, and say, ‘ Gee, you’ re so much cooler than my mom.’  True, my motives for signing up weren’ t entirely sincere. I wanted to change someone more than bond. But as I listened to Rose talk about how vital role models were in the lives of these girls, I remembered how I do believe that children are our future. Teach them well. Let them lead the-

‘ How often would you want to see a Little?’  she asked abruptly.

‘ How often?’

‘ Yes. Most people do outings once a week. Or every other week.’

‘ Weekly,’  I said, amazed that that was all they were asking. Why hadn’ t I thought to do this before? Why didn’ t more people? ‘ Definitely weekly.’  Excitedly, I added, ‘ It’ ll be so fun! Taking a girl shopping for cute little outfits, and-’

‘ We frown on shopping sprees,’  Rose chided. ‘ It’ s not to spoil them so much as to be a positive influence. We suggest sporting events or going to the beach or museums. Even cooking together can be lots of fun and very rewarding for both of you.’

‘ Of course,’  I said, reddening.

Now I knew why more people didn’ t do this. It sucks enough to not get a job you want-it’ s downright humiliating to be rejected for a volunteer position. How big a loser would you have to be for that? I didn’ t care to find out. There was a matter of a July 12 deadline, and if I didn’ t get a Little Sister, odds were I wouldn’ t encounter any more billboards providing instructions on what to do from there.

Rose must have sensed my worry, because she said, ‘ A little shopping is fine.’

She went on to explain that they’ d need to follow up on my references and do a background check, which typically took a few days. ‘ If it pans out, hopefully we’ ll have a match for you soon,’  she said, packing up my file. ‘ Anything you want to add before I let you go?’

I thought about the five months remaining before my deadline. It didn’ t seem like much time to change a life, but it was all I had. ‘ Only that I’ m eager to get started,’  I said heartily.

FEBRUARY 14. Valentine’ s Day. The day started on a sour note by being Valentine’ s Day. It then went from bad to worse before I even changed out of my pajamas. I’ d stepped on the scale to discover that I’ d gained five pounds. I didn’ t need Linda and her spreadsheet-making abilities to know that that constituted half of my total weight loss regained-and that every one of those pounds had gone straight to my ass.

No chocolates for me, I realized, sighing. No nibbling at the heart-shaped cookies people would bring into the office. No celebrating the holiday in the way I’ d come to know it: as an excuse to consume mass quantities of sugar with joyous abandon. Not after seeing how much I weighed.

Then again&

I leaned over to pick up the scale. Then I placed it directly into the trash.

#17: Throw away my bathroom scale.

That Marissa was a genius, I thought as I scrambled an egg for breakfast-compensation for the damage I’ d be doing later to my blood sugar. Getting rid of that scale had been positively liberating. So much so that I’ d have tossed away my body shaper underwear, too, if it weren’ t for that one blue dress that I look lumpy in without it.

SHORTLY AFTER LUNCH-I’ d had a chicken salad to make up for the damage I in fact did to my blood sugar-I popped into Susan’ s office. ‘ Am I still on to baby-sit tonight?’

She peered around a bouquet big enough to be mistaken for shrubbery. That was her husband, Chase. More is always more. ‘ If you don’ t mind-I’ d be forever grateful. We’ ve got reservations at Nic’ s. Chase’ s mother offered to watch the boys, but she had that toe surgery the other day. I hate to ask her to run after a couple of five-year-olds so soon.’

‘ It’ s no problem,’  I assured her.

I knew it was a special holiday for them since-and only Susan could pull this off-they’ d met on Valentine’ s Day. It was back in college, when she and I were at a bar refusing to feel like losers because we were stag. At one point, a drunk guy the size of an army tank bumped into Susan, making her spill her drink over herself. Then he lumbered on without an apology. Chase-who stands six feet two and at the time probably weighed 120 pounds dripping wet-came running over. He tipped his chin in the lunk’ s direction and said, ‘ You want me to kick his ass?’  We gaped at him for a moment, stunned, and he said, ‘ I’ m kidding. The guy’ d smash me like a bug.’  Susan was instantly smitten, and I’ m pleased to report that Chase has since filled out nicely.

They live a few miles from me in Brentwood, in a three-bedroom ranch-style house that they bought for a song at an auction and that-thanks to California’ s ridiculous real estate market-was recently appraised at more than a million dollars. I call it the palace even though it’ s only about 1,600 square feet.

I arrived at the palace at seven o’ clock. Susan had already fed and bathed C.J. and Joey and dressed them in their pajamas. ‘ Hey, beasts!’  I called to them in the living room, where they played with Legos.

C.J. and Joey-identical twins-were dark and gangly like their father. The only way I could tell them apart is by the scar Joey got when he fell off a table as a toddler. Joey squeaked an excited, ‘ What’ s that?’  when he noticed I held a big box, hopeful it was a treat of some kind. He and his brother went back to their Legos when I showed them it was only a bunch of Marissa’ s yearbooks.

‘ I figured tonight might be a good time to look through them,’  I explained to Susan as she and Chase tossed on their coats.

‘ Good luck& hope you find what you’ re looking for. And thanks again for doing this,’  Susan said. ‘ We won’ t be long.’

‘ No later than ten,’  Chase added. ‘ I plan to be home in time to get my Valentine’ s Day booty.’

Susan grinned at him. ‘ Then that chore is out of the way until Easter.’

‘ Ah, I’ ll wear you down before that. Besides’ -he grabbed his keys and pulled on the door-’ you’ re forgetting about Presidents’  Day.’

‘ Shut up with your boasting about your sex life!’  I cried as they waved good-bye to me and the boys.

Once they left, I warmed up pizza for myself and proceeded to do what I always did when watching C.J. and Joey: let them run wild. Allowed them to pull out toys and games and balls and never made them put the old toy away before bringing out something new. Eat whatever they wanted. It was okay, the way I figured it, since I didn’ t baby-sit that often. It has occurred to me that that may be the reason I don’ t baby-sit that often.

The only time I scolded them at all the entire evening was when I noticed they’ d left the door open to the cage of their guinea pig, Aunt June, named after yours truly. (Susan said it was proof of the boys’  affection for me; I suspect there may have been prompting on her part.)

‘ We always keep it open,’  C.J. explained when I showed him the unhooked latch.

‘ Doesn’ t she escape?’

‘ Nope.’

Joey then grabbed a sprig of parsley from the refrigerator to demonstrate. Even when he held the treat just outside her reach, she merely leaned on the base of the door and squealed. He tossed the parsley into the cage. ‘ We asked for a dog.’

It was a little after nine o’ clock when the boys finally passed out on the living room floor. I had to step over C.J., curled up at my feet, to get the box filled with yearbooks.

Wrenching as it was, I made myself thumb through every one in search of Buddy Fitch. But there wasn’ t a trace of him. No one named Fitch at all.

So he wasn’ t a high school classmate. Although it meant that the search continued, I felt a degree of relief. I’ d been weaned on teen movies where the basic principle is survival of the fittest, so I feared the worst. I’ d concocted all sorts of scenarios regarding who Buddy Fitch might be. Most involved him starring as a wealthy, popular jock-think Steff, the head ‘ richie’  in Pretty in Pink-a boy who would have gotten his jollies from abusing Marissa for being fat.