Graduation Party Hot Tub

Ok, like I said before, my girlfriend is a small cute girl, and generally pretty conservative. Well we were at a friends graduation party for when he finished his undergrad. He was living with his parents for the summer while he job searched, and his parents lived way out in the middle of nowhere- a couple hour drive. Well we were introduced to some new hillbilly backyard billiard games we had never played before, and as the night began we started opening up the beer (a good start to any story). As college kids, we were used to drinking in crappy apartments and sneaking in dorms, so drinking in a nice big house/garage/back patio was a nice change. Come about 2am, we decide it would be a great idea to get in the hot tub. Sure, it was like June, but it would still be relaxing enough. There's probably a dozen guys left hanging out, then my girlfriend, the host's girlfriend, and her cousin. The guys just get in our boxers, easy enough. The girls, of course, have more to worry about. My girlfriend ended up deciding on just taking off her bra, and going in her white cami and panties. The host's girlfriend just wore a t-shirt of the host's, and the cousin punked out and went to bed. Well, we were all sitting around and drinking and carrying on and being loud, and it must have woke up the host's parents, because his mom came down and asked us to try to be a little quieter so his dad could get up for work in the morning. Since it was night out, and we hadn't bothered to turn the lights on outside, his mom couldn't really see us when she came down to talk to us, so she flicked on the light switch for the patio/hot tub, and commented something to the effect that "jeez, it's pitch black out there. One of you is liable to slip and hurt yourself." When the lights came on, my girlfriend's breasts could be seen almost perfectly under the wet cami while she was under the water. I remember noticing that you could see her tan lines, and tell under her shirt where her breasts were pale from the shape of her bikini. Her nipples were for the most part visible, though the flow of water somewhat kept the shirt pulled from being skin tight. She noticed, and kind of slouched into more of a shady side, and tried to look natural while covering herself. I never brought it up or asked, but I don't know how a single one of them couldn't have seen her sitting there with a see through cami on. Anyhow, we drank and relaxed in the tub for a while longer, and as you kind of have to do in order to avoid being so hot you die, we would get up and sit on the edge of the hot tub and cool off, then slide back in to relax some more. After a while, my girlfriend finally lifted herself up, and sat with her arms across her chest. After the second or third time getting out, all the while enjoying very strong mixed drinks, she just lifted herself out and stopped bothering to cover her chest. The shirt was sucked perfectly against her small B-cup boobs. Her nipples were perfectly visible. Everything was visible- ****, stomach, the whole nine yards. At one point she pulled the shirt forward some to pull air in, but it just un-sucked the cami from between her breasts, and left it still exposing the rest of her boobs along with her nipples. We finally got out of the tub to go pass out, and when she got out her black panties clung to her *** cheeks just as well as the cami did to her upper body. A couple of hours of drunken semi-nudity isn't the most risque' thing in the world, but it's a lot for me!