Waving my hands in the air, I interrupted her to say "Sure, I can keep an eye on them for a night; that's not a problem. Don't worry about getting them fed, either. Go take your test and get certified for whatever, so you can get that promotion and start making a little more money. I know you have a hard time keeping up with everything, sometimes."
From the look on her face, I knew that she still thought she was asking me a big favor (she wasn't), and that she was grateful that I was willing to help her out that way. It didn't take us long to work out the details; I had only my bed at my place, so me going over to her house so the girls could sleep in their own beds was a no-brainer. I agreed to let Andrea cook supper for us before she left, so that all we'd have to do would be heat it up when we were hungry. Despite her assurances that it was fine for me to use her bed, I told her I'd just sleep on the couch, since it was easily large and comfortable enough for me. Emma and Gail would be informed in no uncertain terms that whatever I said was law until she got home, just to make sure they behaved themselves; I knew they would, anyway, but it made Andrea feel better to tell me that she'd say it. There were a couple of other things, but they were fairly trivial and easily dealt with. Andrea was going to call to make her appointment to take the test the next day; when she got home, she'd be able to tell me when I'd be pulling Substitute Parent duty.
We chatted a little bit longer before she told me that she needed to get home again. On her way out, she thanked me again (a couple of times) for agreeing to help her out.
She let me know the next evening that her appointment was for Tuesday of the following week.
That easily fit with what I had to do, and I reassured her that I'd be able to look after the girls without any problems.
The next time Emma and Gail came over, both of them were happy for their mother, and delighted that I was coming over to spend the night with them. I let them know that I was glad to keep them company, and that seemed to be all they needed to hear before they went out back to swim for a little while. I welcomed the opportunity to stay inside where I could watch them without being noticed, entranced by their lithe figures in the bikini swimsuits their mother let them wear. Both girls had small, but noticeable, busts (Emma's was naturally a trifle larger); and both of them had firm little asses that were a treat to watch. At their age (14 and 13, at that time), they still looked a little coltish with their long, slender legs — but that was part of their beauty, to me. As they splashed around in the cool water, I caught occasional glimpses of hard nipples denting the cups of their bikini tops.
They came over again a couple of days later, and I let them talk me into joining them in the pool.
A water fight gave me the opportunity to see that their suits weren't quite as opaque when wet; the bumps of hard nipples told me were to look for nipple colors — I couldn't see a color for Emma, and Gail's looked to be a dark pink. I couldn't see any indication of the color of their pubic hair, which suggested that they either didn't have any, or it was as blond as what was on their head — both choices appealed to me equally. A little later, we got into a dunking contest, which gave me the chance to get their nubile young bodies in my hands and arms as we tried to push each other under the surface. By the time we got out of the pool, I was actually looking forward to spending the evening with them…
When the fateful day arrived, Andrea came over to get me about an hour before she had to leave; that let her make sure I heard her tell them to behave themselves, and that they knew what their bed time was, and that they should go to bed just like they always did. The girls exchanged a look with each other at that, but I didn't think anything of it. Some time later, the cab Andrea needed showed up, and she left to catch the train that would take her the couple hundred miles to the town where her test was given. Emma and Gail wanted us to play a board game, but I told them that they needed to take care of their homework first. Andrea had told me that both of them had schoolwork to do almost every night, and I thought there was a pretty good chance that they'd try to get out of it without their mother there. The expressions on their faces told me that they'd tried to put one over on me, and it hadn't worked; with the admonishment that they needed to take care of school first, both went back to their rooms, leaving me alone to watch a little bit of television.
Not being much of a cook, I carefully followed the printed instructions Andrea had left for the casserole she'd made for us. My timing was almost perfect; the girls came into the kitchen to ask about supper just a couple of minutes before the timer went off, letting me know that the food was ready. Supper was casual, and informal; when it was over, both of them got up and quietly went about taking care of the dishes and leftovers. After they were done, I told them that I'd take both of them on in the board game they'd wanted to play. After Gail had beaten Emma, and thoroughly trounced me, the three of us sat in the living room to watch television. When their bed time came, both of them got up and let me know they were going to bed — and asked if it would be okay for them to kiss me good night. I said that it would, and they hurried back to their rooms to get ready for bed.
My attention was on the TV, so I didn't notice when they came back into the living room until one of them cleared her throat. When I turned toward them, I wasn't anywhere near ready for their appearance — all either of them had on was a (very!) brief pair of panties. No shirt, no top, no bra, nothing to conceal their breasts. After I managed to drag my eyes up to their faces, I asked "And just what do you think you're doing, coming in here like that?"
Emma just smiled, and told me "Mom said we should go to bed just like we always do — and this is it. Honest, you can even ask her when she gets back."
Gail calmly informed me "Besides, we saw how you were looking at us in your pool the other day, and we thought you'd like to see what we look like.", followed by Emma's nod of agreement.
Somehow, I didn't doubt that that was exactly how they "dressed" for bed each night. With Gail's invitation that I could look at them, I did just that.
As I'd thought, Emma's bust was a bit larger than her sister's — but not by a whole lot. Her areolas were just a trifle darker than her skin, which easily explained why I hadn't been able to see them through her bikini top. Each was about the diameter of a nickle, and sported a nipple that was perhaps a quarter of an inch across, and the same high. Her breasts were each roughly the size of half an orange, and rounded. When I looked at Gail, I saw that her areolas were rose pink, and slightly puffy, with nipples that were perhaps the size of a Navy bean. Her breasts were a bit larger than half a tennis ball, and more conical than rounded. I couldn't see a mark or blemish on either girl, and their skin looked like pale pink porcelain, it was so fine and delicate in appearance. My eyes dropped to their panties, and I saw that both pairs were sheer enough to let me see that each girl had small, sparse patch of hair only marginally darker than what was on her head.
After I'd done my best to memorize the sight of them, I told them "You're lovely — both of you.
Thank you for letting me see you like this, though your mom would have a conniption if she ever found out you did it. Now, off to bed for you both."
First Gail, then Emma, stepped forward to give me a kiss on the cheek before turning and walking back toward their rooms — giving me the pleasure of watching their lovely little butts as they moved away from me.
Once they were gone, I sat back on the couch again and started wondering what had prompted them to give me that little show. Yes, Gail had said they thought I'd like to see what they looked like; and yes, Emma had said that was how they always went to bed — but I didn't think for even a moment that they didn't know what Andrea had meant about them going to bed, or that there wasn't something more involved than just letting me look at them.