You take her from behind

You turn Lindsay around and have her get on her hands and knees so you can do her doggie style. For about 5 minutes you finger her and rub her clit with your fingers. Lindsay starts to moan, but you have more planned.
You then start to rub her clit and folds of her pussy with your penis and you can tell she is getting excited.
"You.......are......unnhhhh......very good.........with.....your..ohhhhhh.....penisssss!" Lindsay exclaims.
Then you decide to insert your penis into her, but ever so slowly because you don't want to hurt her. You push the head into her pussy and she moans in delight. The you slowly insert your penis all the way in and loves how easy it is with all the lubrication. It takes a minute or so, but you get a rhythm going with her; as you thrust your penis in, she thrusts back and as you pull back, she pulls forward. With your penis going in and out, you know her clit still needs attention, so you reach around and slightly press her button to get her even more excited. You keep pumping her and pumping her and just when it seems like she's about to explode, you pull out. She gives you a look and you can tell she's impatient, but it will all be worth it in the end.
Next you lie down and motion for her to get on top. She happily obliges and climbs on you. She positions herself above your penis and aims it for her pussy. Her pussy is dripping with anticipation. She slowly starts to raise and lower herself geting into a good rhythm. As she does this you run your hands up and down her smooth legs and stomach and rub her small, but erect nipples. She also notice that she is really enjoying this and is moaning. You give her ass a squeeze and she giggles. She really loves having her ass touched and played with.
The you position your thumb so that as she raises and lowers herself on your penis, her clit brushes by. This is more than she can take and you sense she is reaching orgasm. You have great staying power and wanted to reach orgasm as she does, so you let loose and you both orgasm at the same time. She collapses on to you and you tell she is appreciative as she gives you a kiss. After a few minutes, you recover and find that Lindsay is flat out.
You decide to find out if there is some running water. Walking down the hall, you find a bathroom and turn a tap on. To your surprise, the water is running! You find it odd that a seemingly abandoned town would have running water and electricity. Maybe the town isn't abandoned. Could it have anything to do with that house you passed earlier that wasn't boarded up? Maybe, but you don't know. You think back to what Lindsay said before about there being an underground complex around here.
You need to have a shower, but it must be quick, there's work to do. After your shower, you head back to the room where you and Lindsay had "fun" and find her asleep. You think this is a good opportunity to find out more about her. She has her backpack over by the table and then there are her clothes. Maybe there could be something in one of the pockets. You also reason that since there is running water and electricity, there might be a computer with databases or even the WNP (World Net Project) that was launched after the World Wide Web collapsed after the comet hit. You are also convinced that the noises you heard before were not the noises of the building and that there might be something that needs checking out. You don't want to pass up the opportunity to check out if Lindsay is telling the truth, but your most pressing concern might be to check out the rest of the building and the grounds around it.